I have successfully reared some tadpoles, rescued from a friends pond - she has fish and they always seem to eat the frogspawn. Anyway, they have grown and now 2 have turned into baby frogs. I have given them a shelf, they have live dahpne in the water, and plants, but I would like to release them. Do they need a pond? I have a small brook in the garden, but it flows quite quickly. I dont want to release them if they cant look after themselves. Do I have to keep them captive now?