I have 2 african dwarf frogs living in a 5 gallon tank, there is an internal filter, a whisper, pretty small. Also an air stone, but I have it set to about 1 bubble a second, since they don't like much water movement..
Well they usually get somewhat sucked on the bottom of the filter, but I thought it was on purpose after a while since they could what seemed easily get out, get air, then swim back down and go under again, maybe hey like the feel?
However today I saw just front legs sticking out, and they weren't just on he outside this time, he has gone in! So I turned the filter off and shook him out, must've just happened since they can only go 10 minutes without air, and he was still alive.
What can I do or put over the filter to make it safer? Would a sponge filter even be a good idea since they don't like air stones?