Question 1

Does it come with a pre-filter? Also do the tetra whisper small cartridges fit?

Accepted Answer

It does not come with a pre-filter, but the fluval edge pre-filter fits pretty well. You just have to use some hot glue and glue it to the intake tube. As for the tetra cartridges, im not sure. I've been using some extra API crystal bio-chem zorb cartridges I have, which don't fit perfectly, but they work.

Question 2

What size should I get for my 3 gallon tank? Is this safe for a Berra fish?

Accepted Answer

In my opinion, this filter assembly Penn Plax Cascade 20 mini should do the job for up to a 7 gallon tank. This filter assy. has a flow control knob you can adjust the flow of filtration from slow to fast for fine adjustment of flow or for feeding time to shut off filtration while feeding so as not to filter the food out of water. This is a nice feature as you do not need to unplug the filter assy., while feeding, it bypasses a small amount of water and does not harm the pump. I really like the Cascade filters, I have two 300's on my 55 gallon tank.  I believe your other question is it safe for a betta fish not Berra? When I started out with a one and a half gallon tank and one Betta, I asked at a fish store on Betta care and the store told me they don't need filtration or aeration and they only live a couple years if you are lucky. I didn't buy this info. because I put myself if a fish position not wanting to breathe and swim in my own waste. I used filtration, aeration and a small heater to keep a constant on temperature for the lil guy and it lived for five years!  So I'd say the filter would be safe. Some say I do overkill, but I enjoy happy, healthy fish! I also use BettaSafe water conditioner to start off with also. I hope this helps you!

Question 3

Does the carbon side of the filter face the tank?

Accepted Answer

Yes.  The flow of water should hit the white filter media first, then pass through the carbon, and out into the tank.

Question 4

can i use activated carbon and ceramic for the filter media?

Accepted Answer

No room for ceramic and carbon

ASIN	B00T6HPZFI
ASIN	B00T6HPZFI
Age Range Description	All Life Stages
Best Sellers Rank	#37,492 in Pet Supplies ( See Top 100 in Pet Supplies ) #172 in Aquarium Filters
Brand Name	Penn-Plax
Color	black & Blue
Customer Reviews	4.1 4.1 out of 5 stars (1,649)
Date First Available	June 22, 2015
Date First Available	June 22, 2015
Directions	Follow included instructions
Included Components	Aquarium Filter
Item Dimensions LxWxH	3.5 x 5.2 x 4.8 inches
Item Package Dimensions L x W x H	5.28 x 5 x 3.74 inches
Item Weight	11.2 ounces
Item model number	CPF6
Item model number	CPF6
Manufacturer	Penn Plax, INC.
Manufacturer	Penn Plax, INC.
Model Name	CPF6
Number of Items	1
Product Dimensions	3.5 x 5.2 x 4.8 inches; 11.2 ounces
Size	Cascade 20
Specific Uses for Product	Indoor
Target Audience Keyword	fish
Warranty Description	Full Amazon Warranty

Penn-Plax Cascade 20 Power Filter – Mini Hang-On Filter with Quad Filtration – Great for Freshwater and Saltwater Setups, (Model: CPF6)

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