Looks like a Mantella Betsileo. Their care is kind of a cross between a tree frog and a dart frog. The Betsileo have a very broad range in the wild. They range from the arid mountain regions of western/ south western madagascar to the tropical rainforests on the east coast. If they were captive bred, your best bet is to find out what conditions the breeder kept them in.

Otherwise, Marc's page that Terry linked to is indeed the finest care sheet out there.