What the heck is this ???

I'm still cycling my new tank. Ammonia is .25 Nitrates haven't went up yet.
Anyway, looked in there tonight, only see 8 of the 9 damsels. And seen this ugly thing on my rock. What is it and is it good or bad ?

Pics aren't very good, the first pic, it is on the top center.

Thanks !!!


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Looks safe. You probably have 8-9 damsels too many, also ;)
Wait for your cycle to complete before adding any more fish to obtain optimal results.