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i just noticed this sea urchin, but i have no idea what kind it is. can anyone help me? the pointy parts are purple and the body is black and fuzzy

a bunch of these just randomly popped up in my tank recently. do any of you know what they are?

I have an aqua medic turboflotor blue 1000, it's the one that hangs on the side of the tank with a pump just inside the water and pvc pipe on the output spot, and a collection cup up on top. I just had to replace the intake pump on this, and when they finally managed to send me the right pump...

I have a 120 gallon saltwater setup with live rock, two ocellaris clowns, roughly 6 itty bitty brand new hermit crabs, 5 turbo snails, 3 astrias, 2-3 ceriths, and 2 emerald crabs. I have a nitrate problem that weekly water changes do not seem to help and I do maintenance on the tank every day...

Ok, the crab is all white, with no specific markings other than blue eye-stalks. I bought 5 hermit crabs from the local pet store and one of them looked like this. Then I found another one hiding in one of my live rocks, seemingly shell-less. What the heck is it and is it supposed to be out of...