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I found they're pretty happy without it. As far as heat goes, I think they like a little, just not too much! Mine are kept in a large betta bowl like thing, with rare heat (only when its super cold). They're about 2 and a half years old and still spunky...
I keep mine in temps anywhere from 78-80 Degrees. It is doing fine. I don't know about the salt thing, since I don't use any, but my frog is doing fine in my community tank.