Thanks Shorty. I would consider feed training if it's reasonable, but my main reason for keeping them in a cage is to grow them to a size where I can ID them better. I can accomplish that by getting them to about 2 or 2.5 inches. If they won't take pellets I can get some BSFL going in a hurry and there are a ton of mosquito larvae around.

I'm also considering keeping them in a 55 gallon tank until I can ID them.