Re: heat mat or lamp?
A large heat lamp will do. It'll be cheaper and some argue that it's safer for crabs, because UTH can burn a crab if they bury right on top of the thing. I used to use an UTH though and it never posed a threat to my crabs. I don't think crabs are THAT dumb that they'll decide to molt or rest on top of a really hot area...
In any case, I say lamp. Why? Because it's cheaper.
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