I know they aren't super nutritious, but my son likes doing it and our 8 chromis seem to enjoy chasing them around. And the babies may end up being eaten by the mandarin. Raising them to adulthood is more just to see if we can and I might as well feed em to the tank lol. Thanks for the advice on the phyto, that's what we have in there now but I am not sure what to give them when/if they get bigger.