I have a 5 1/2 gal for guppy fry and I have a corner filter in there cause the current isnt real bad and they can swim (I did have a outside whisper filter in there but they babies couldnt swim cause of the current) but yesterday I found on of my babies stuck in there and he died I was wondering if there is a different filter I could use in a baby tank that wouldnt hurt my babies? I have heard of sponge filters but I can not find them anywhere around here..Any advice would be appreciated cause I dont want to lose any more babies!!!