---
product_id: 6541406
title: "Seachem Stability - For Freshwater and Marine Aquariums 250ml"
brand: "seachem"
price: "$22.75"
currency: USD
in_stock: true
reviews_count: 9
url: https://www.desertcart.us/products/6541406-seachem-stability-for-freshwater-and-marine-aquariums-250ml
store_origin: US
region: United States of America
---

# Fresh & marine safe Synergistic bacterial blend Rapid biofilter establishment Seachem Stability - For Freshwater and Marine Aquariums 250ml

**Brand:** seachem
**Price:** $22.75
**Availability:** ✅ In Stock

## Summary

> 🌟 Transform your tank from zero to thriving ecosystem in no time!

## Quick Answers

- **What is this?** Seachem Stability - For Freshwater and Marine Aquariums 250ml by seachem
- **How much does it cost?** $22.75 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/6541406-seachem-stability-for-freshwater-and-marine-aquariums-250ml)

## Best For

- seachem enthusiasts

## Why This Product

- Trusted seachem brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Stress-Free Cycling:** Introduce fish anytime—new tank syndrome is history.
- • **Broad-Spectrum Bacteria:** Aerobic, anaerobic & facultative strains working 24/7 to break down toxins.
- • **Consistent Water Quality:** Maintain crystal-clear, healthy water with monthly dosing.
- • **Rapid Tank Stabilization:** Kickstart your aquarium’s biofilter in days, not weeks.
- • **Safe for All Aquatic Life:** Non-toxic, no hydrogen sulfide, perfect for fish & plants alike.

## Overview

Seachem Stability is a powerful 250ml bacterial supplement designed to rapidly establish and maintain the biofilter in both freshwater and marine aquariums. Its unique blend of aerobic, anaerobic, and facultative bacteria accelerates the breakdown of harmful waste compounds like ammonia, nitrite, and nitrate, preventing new tank syndrome and ensuring a safe, stable environment for all aquatic life. Easy to use and safe for fish and plants, Stability supports ongoing water quality with monthly maintenance dosing.

## Description

Seachem Stability - For Freshwater and Marine Aquariums 250ml

Review: Works really well - Has been working really well for the startup of my tank. Doesn't really have a smell and is the perfect size bottle for my 3-gallon aquarium. I feel safe using this product and my water quality has been really good since using it.
Review: I cycled in 19 days. I love Seachem. I wont use anything else for my aquarium. - I'm new to the hobby. I had recused a betta with fin rot from Petco. He lived in a 1/2 gallon hospital tank while I proceeded to research everything there was to know about aquariums. I also had time to desertcart Prime his entire aquarium. Thanks to Seachem, my extensive research (the nitrogen cycle is an important thing to study), and desertcart Prime...I now have a fully cycled super healthy aquarium! This stuff worked great. I have a betta. They have a small bioload. So it took longer to establish my cycle....19 days. If I would of had time I would of done an ammonia fishless cycle prior to purchasing the fish. But I rescued him. And I didn't have that option. Thanks to Seachem Prime he was 100% safe throughout the entire cycle. Just follow the directions. Use Seachem Prime every 48 hours. And test your water to monitor your progress! Honestly it was a ton of fun for me to watch my progress. I fell in love with the hobby more and more every single day. I'm so glad I found this hobby! I have the Fluval Spec 5 Gallon. And I did over dose the Stability by a few milliliters during the first week. Warning: This worked but also caused a major biofilm. It freaked me out. You will cloud a little bit at first. And develop a biofilm. You probably wont develop as sever of a biofilm if you have good surface movement. Since I have a betta, who prefers calm waters, I had to baffle the outflow nozzle to slow it down. This slowed surface movement combined with the extra dosage of Stability created the biofilm. However, as soon as your filter starts growing bacteria that film starts just disappearing on its own. Took about a week to fully clear. It was about 10 days before the water really cleared up and the film was gone. My cycle took 19 days. Betta's have a small bioload. This was a major contributor to the extended duration of my cycle....if I had a higher bioload it wouldn't of taken 19 days. If I had done a fishless cycle with ammonia it would of been super quick. About 12 days into the cycle I added a mystery snail. They have huge bioloads compared to bettas. So of course I dosed stability for 3 days. To grow additional bacteria in my biofilter. This also extended my cycle. Everything happened just as I expected it to. And I am a newbie. 100% newbie. Now that I am cycled I will continue to add the recommended dose during weekly water changes. I don’t think this would be necessary if you maintain the health of the aquarium. But it won’t hurt and is a good idea. I will also add this for a few days if I add any new inhabitants to compensate quicker for the increased bioload. Seachem is an amazing company. Their products are the clear favorite among hobbyists. And their customer service is amazing!!! Just head over to their site and send them an email. Or sign up for their forums. Or just go to google and search...chances are there is a fish forum somewhere with a user asking about the same thing you're wanting to know. This product is in spore form. It does not need refrigeration. Nor do you have to worry about high temps during shipping. Obviously you don't want it to be subjected to the elements more than it needs to be. But I know some brands are notorious for 'going bad' in the shipping process. RESEARCH! Buy this. And have a great time with your aquarium!! This is a great product. Just do not forget to test your water. Most use the API Master kits.

## Features

- TANK STABILIZATION: Seachem Stability will rapidly and safely establish the aquarium biofilter in freshwater and marine systems, thereby preventing the #1 cause of fish death: "new tank syndrome".
- TREATMENT: Stability is formulated specifically for the aquarium and contains a synergistic blend of aerobic, anaerobic, and facultative bacteria which facilitate the breakdown of waste organics, ammonia, nitrite, and nitrate.
- BACTERIA GROWTH: The necessary conditions for the growth of Stability's bacterial strains encompass a very broad range. When other bacteria begin to die off (usually from high organic loads caused by the unknown death of an organism), Stability simply becomes more effective.
- USE: Shake Seachem Stability well before use and turn off UV/ozone filter. Use 1 capful (5 mL) for each 40 L (10 US gallons) on the first day with a new aquarium. Then use 1 capful for each 80 L (20 US gallons) daily for 7 days. Fish and other aquatic species may be introduced at any time as long as the dosage is maintained for 7 days.
- SAFE: The bacteria employed by Stability are non-sulfur fixing and will not produce toxic hydrogen sulfide. Stability is completely harmless to all aquatic organisms as well as aquatic plants, thus there is no danger of overuse.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002APIJG |
| ASIN  | B0002APIJG |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #8,551 in Pet Supplies ( See Top 100 in Pet Supplies ) #10 in Aquarium Test Kits |
| Brand Name | Seachem |
| Color | Black |
| Customer Reviews | 4.8 4.8 out of 5 stars (5,881) |
| Date First Available | October 2, 2001 |
| Date First Available  | October 2, 2001 |
| Department | Unisex-Adult |
| Department  | Unisex-Adult |
| Directions | Shake well before use. Turn off UV/ozone equipment. Use 1 capful (5 mL) for each 40 L (10 US gallons) on the first day with a new aquarium. Fish and other aquatic organisms may be introduced any time as long as the dosage is maintained consistently for 7 days. For maximum biofilter performance use 1 capful for each 80 L (20 US gallons) once a month, as well as in addition to each water change, whe… |
| Included Components | Seachem Stability - For Freshwater and Marine Aquariums 250ml |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 6.1 x 1.8 x 1.2 inches |
| Item Package Dimensions L x W x H | 6.57 x 1.81 x 1.73 inches |
| Item Weight | 8 Ounces |
| Item model number | 126 |
| Item model number  | 126 |
| Manufacturer | Seachem Laboratories, Inc. |
| Manufacturer  | Seachem Laboratories, Inc. |
| Manufacturer recommended age  | 1 month and up |
| Material | Plastic |
| Model Name | Seachem Stability - For Freshwater and Marine Aquariums 250ml |
| Number of Items | 1 |
| Product Dimensions  | 6.1 x 1.8 x 1.2 inches; 8 ounces |
| Size | 1 |
| Specific Uses for Product | Active |
| Target Audience Keyword | fish |
| Warranty Description | Warranty |

## Product Details

- **Brand:** Seachem
- **Item Form:** Liquid
- **Item Weight:** 8 Ounces
- **Liquid Volume:** 250 Milliliters
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

![Seachem Stability - For Freshwater and Marine Aquariums 250ml - Image 1](https://m.media-amazon.com/images/I/61u-6QoN-DL.jpg)

## Questions & Answers

**Q: What is the difference between pristine and stability? is bacteria different? or just a different name for basically the same product?**
A: Yes the bacteria is different and they serve different purposes.
Pristine breaks down organic matter in the tank into ammonia.
Stability turns ammonia into nitrite then to nitrate which is safe for your fish and taken up by plants as food.
This is a very simple explanation as there may be some slight overlap in their uses. Take this as broad strokes.

**Q: Do I need to add ammonia to the tank while using this product if there are no fish in the tank yet to produce it?**
A: Personally, I use the dose for the time suggested whilst starting up new tanks and sometimes old tanks with dieoff occurring from exposed live rock to introduce the good bacteria to allow it to build to its proper level allowing the bacteria to consume ammonia.

After ~ a week...' Ghost/Phantom' feed with a pinch of food daily until you have an ammonia reading. At that point, you can stop adding the food and let the bacteria run its course.

Slow is smooth...

**Q: Do I need to use this every time I change 100% of water in my 3 gallon tank?**
A: Hi. Yes. But we didn’t recommend make 100% water change. Is better just 25% water change every 3 weeks.

**Q: Can I use in a koi pond to start bacteria**
A: Hi. Im sorry, but i don't know. You need to ask someone that have a koi pond.i use it for my aquarium and i like this product

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works really well
*by A***H on February 6, 2026*

Has been working really well for the startup of my tank. Doesn't really have a smell and is the perfect size bottle for my 3-gallon aquarium. I feel safe using this product and my water quality has been really good since using it.

### ⭐⭐⭐⭐⭐ I cycled in 19 days. I love Seachem. I wont use anything else for my aquarium.
*by K***E on September 6, 2018*

I'm new to the hobby. I had recused a betta with fin rot from Petco. He lived in a 1/2 gallon hospital tank while I proceeded to research everything there was to know about aquariums. I also had time to Amazon Prime his entire aquarium. Thanks to Seachem, my extensive research (the nitrogen cycle is an important thing to study), and Amazon Prime...I now have a fully cycled super healthy aquarium! This stuff worked great. I have a betta. They have a small bioload. So it took longer to establish my cycle....19 days. If I would of had time I would of done an ammonia fishless cycle prior to purchasing the fish. But I rescued him. And I didn't have that option. Thanks to Seachem Prime he was 100% safe throughout the entire cycle. Just follow the directions. Use Seachem Prime every 48 hours. And test your water to monitor your progress! Honestly it was a ton of fun for me to watch my progress. I fell in love with the hobby more and more every single day. I'm so glad I found this hobby! I have the Fluval Spec 5 Gallon. And I did over dose the Stability by a few milliliters during the first week. Warning: This worked but also caused a major biofilm. It freaked me out. You will cloud a little bit at first. And develop a biofilm. You probably wont develop as sever of a biofilm if you have good surface movement. Since I have a betta, who prefers calm waters, I had to baffle the outflow nozzle to slow it down. This slowed surface movement combined with the extra dosage of Stability created the biofilm. However, as soon as your filter starts growing bacteria that film starts just disappearing on its own. Took about a week to fully clear. It was about 10 days before the water really cleared up and the film was gone. My cycle took 19 days. Betta's have a small bioload. This was a major contributor to the extended duration of my cycle....if I had a higher bioload it wouldn't of taken 19 days. If I had done a fishless cycle with ammonia it would of been super quick. About 12 days into the cycle I added a mystery snail. They have huge bioloads compared to bettas. So of course I dosed stability for 3 days. To grow additional bacteria in my biofilter. This also extended my cycle. Everything happened just as I expected it to. And I am a newbie. 100% newbie. Now that I am cycled I will continue to add the recommended dose during weekly water changes. I don’t think this would be necessary if you maintain the health of the aquarium. But it won’t hurt and is a good idea. I will also add this for a few days if I add any new inhabitants to compensate quicker for the increased bioload. Seachem is an amazing company. Their products are the clear favorite among hobbyists. And their customer service is amazing!!! Just head over to their site and send them an email. Or sign up for their forums. Or just go to google and search...chances are there is a fish forum somewhere with a user asking about the same thing you're wanting to know. This product is in spore form. It does not need refrigeration. Nor do you have to worry about high temps during shipping. Obviously you don't want it to be subjected to the elements more than it needs to be. But I know some brands are notorious for 'going bad' in the shipping process. RESEARCH! Buy this. And have a great time with your aquarium!! This is a great product. Just do not forget to test your water. Most use the API Master kits.

### ⭐⭐⭐⭐⭐ Quality products!
*by R***A on December 3, 2025*

I really like using SeaChem products. A high quality product that does what it's supposed to do. SeaChem Stability helps establish essential natural bacteria for a healthy biosystem in you aquarium. Easy to use and dose.

## Frequently Bought Together

- Seachem Stability - For Freshwater and Marine Aquariums 250ml
- Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 250 ml
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-17*