This will be the only time I ever recomend a whisper filter. Ive got the 10i in my daughter fire belly toad tank(20g half filled) shes got 2 toads and 8-10 platies & swords in there. the filter keeps the water clear and the ammonia and nitrites at zero. the filter cartridge is easy to rinse off or replace. It sits on a rock top is about 3-4" above waters surface and makes a nice little water fall.