I've committed myself to help my son & 8 yr. old granddaughter establish a Betta home in a Tetra 3 gal. tank. She will not purchase a fish until we all have the home ready & all understand our individual responsibilities. The tank came w/ a air-powered, in-tank Whisper 3i filter & 1 Tetra Bio-Bag cartridge. 3 weeks into the ammonia/fish food combination cycle & Nitrates growing, I see bits of filter floss breaking loose. There's also something that looks like it could the BB's in tiny clusters floating atop the water.
If you would be so kind, I need short term and long term advise on what to do. I'm thinking long term, of converting the filter into more of a sponge filter. It can operate submerged to bottom & extended water bottle column & baffle could hold sponge or filter floss clear to the surface. More filter media = more BB's, right? Short term, I can't thing of anything other than insert a 2nd cartridge in front or behind the coming apart one and ask for help.