Originally Posted by Otterfun
If it is a 2.5g Aqueon MBT, then the filter kind of works but I'd say take it out so you have more space and put in several bunches of anacharis which is ammonia busters. They can be floaters or can be planted. My betta hides underneath it and sometime rest on it (mid-tank level). In the long run, the plants pay for those expensive filter replacement pads.
Ditto for 1g IMO.
I have to agree to take out the filter. If it's bothering him, it might end up shredding his fins, which no one wants that! D:
Just be sure to keep up with the water changes and you should be fine. :)