I looked in the meany filter which just ate one of my frogs and there isnt a tetra in there. The tetras are about a quarter of an inch if not smaller... if that helps any? I read somewhere that bettas and AFDs can eat live food but they didnt say what.
It is an AFD I know that much for sure... :| I found out when disassembling my filter to take it back the missing tetra was in there. Evil filter!! I took it to the lfs and found out that the filter I bought was missing the strainer part.