Yep, that is an urchin. My water is nice and warm now and my eels and other fish seem to be doing ok with the change. In my tank right now are 2 big turbo snails with feather duster on them, 3 "brakish" moray eels, 1 mudfish or dogfish, a pencil urchin and a lunar wrasse. Everything gets along fine but Im going to trade in 2 of my eels and the dogfish at the local fish place for some coral or something else.
Thanks guys