Not completely true if you know the individual fish and isn't know for attacking of tankmates and are within reasonable length of not being bichir food should be okay if you have worries divide the tank or growout in different tank. Also keeping the bichirs all well feed will reduce risk of becoming a future mealmoonchild1970;1649694; said:Yup. Anything they can fit in their mouths. You don't want more than an inch or two difference between the little one and the big ones.