yes it can be bad to give them unnecessary medication. They are dependent on friendly flora to digest their food, and antibiotics kills indiscriminately. So give it to them when they don't need it, they'll feel sick to their stomachs and might go off food.
never heard of a miggy. but if it's a wild insect I wouldn't feed it. you don't know where they've been. they could have been in poison for all you know.
aw okay thankyou!
na, i wasnt goign to feed it a miggy, its just theyre rather small and can get into the tank.. so i was gonna say what if he was to eat one or something, would it harm them. ?