Saigey
Songster
As far as swimming, I let mine start with a few inches of warm water in a rubbermaid thing, then the tub, but always watch and only add more water if they seem to feel comfortable with it. With this new adventure of hatching I've just gone through, I've noticed when they stop splashing and playing, the water is either warm enough that they're relaxed and sleepy, or they're done. 
