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Was just looking at my tank and it has been up and running sence thanksgiving and I just saw the other day Copepods or whatever there called and just saw this sluggish looking bug I attached a pic
Well, it depends... Until you can actually identify what it is there's not definite answer to that question. The only thing I can think of that possibly have spikes on its back that looks like a slug would be a nudibranch... Try to get a clear pic when you see it again. That will help a lot on identifying what it is
It's a chiton 100%. I've had quite a few of them in three different reefs. They're harmless but they will slowly feed on coralline algae. I can tell you though, that ain't a problem at all. Every tank I've ever had them in was covered with coralline. I honestly believe they may help seed the tank with coralline by releasing tiny particles in the tank as they feed. I love chitons. Very cool little animals.