Red Sea Nano Filter question

[Gen2387]

I've received my Red Sea Nano Filter in the mail today and I was wondering if I can replace one of the little sponge inside by a little bag of charcoal that I have and if I can use that extra sponge to put around the part that's in the tank so that my fishy's tail won't get stuck in it.

[Jodah]

The beauty of those filters is that you can put pretty much whatever you like in them.

[callmeconfused]

Yes and yes! I love those filters, I have 3. I agree with jodah, you can fill 'em with whatever you'd like! I buy large filter pads, cut them to size and sew them into little bags I fill with carbon. I make several at a time so I don't have to worry about them last minute. Also, the filters for the tetra 3i will fit in diagonally, then you can put filter material on either side :)

[Gen2387]

GREAT! Thanks guys! My filter is now up and running with a bag of charcoal inside! Can't wait to adopt a second Betta!

[Jodah]

Did not know that about the 3i cartridges! Awesome. Now when I can finally get my red sea nano, I'll be golden.

[Littlebittyfish]

I dont use carbon, I just stuff mine full of aquarium sponge.
You can use sponge or a piece of nylon hose around the intake to keep bettas fins from getting stuck in the intake area.