well we live and learn. what you can do and should do makes for better fish. 35 gallons of circlular tank is not good for bigger fish, round and round they go. if your going to do a hex tank I sugest guppy, or other small fish. fire mouths need lots of room to grow and live peacfully.
LOL! yeah I am pretty sure they will eat the fry and pick to deat the adults . why not give them quality foods instead. ? you never know what kinds of disease the guppy will have if you buy them to feed. unless you raise them your self you do no know. besides, there is some awsome foods out there with way more vitimins and protein and such for firemouths.