I used to Feed them when they were young blanched vege's and shrimp pellets and Algae wafers. JBL wafers are great.Also If you could Put them next to a window or sumthing expossed to light then algae with grow they love that also. Make srue they have Drift wood in there as it Darkens the water and they feel more comfotable in the tank and also Because is contains fital Fibre they need to Become Strong and Healty Fishies!.
Good luck and have fun
Devon