Drosophila should be a fine diet for them, but if they start to look skinny you should try feeding pinheads. Heres my recipe for culturing flies if you don't allready have one : http://freewebs.com.kapoktree , under articles, culturing fruit flies...

I have dendro's and mantellas, so if you have any questions don't hesitate to ask.
-otis07_@hotmail.com
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A room of herps.
www.freewebs.com/kapoktree