Thanks for all or your imput, but I found out that they are dwarfs. This makes it more of a challenge, since the intake of food is limited. Any suggestions here?

They ARE eating bloodworms, some earthworms; I feed them 'Frog and Tadpole Bites', and try to slip some brine shrimp in there, pieces of fish and shrimp, and whatever else.

What, once again, was the best dietary vitamin to use?