I got my aro free as a baby for some convicts still with a yolksac and best thing to do is try to keep water as still as possible, keep him in a smallish tank "kept mine in a 29 till about 4" " . I tried putting him in bigger tanks but didnt do well was always freaked .I fed mine bloodworms from the beginning .I know they get the protien they need from the sac but i always threw a lil bit o frozen bloodworms in with him and he always ate .I am far from an expert but these are the things i learned about mine , yours may be differant good luck there awesome fish some before and after pics are included



