Need help identifying these things in tank

Q50sReef

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What’s up fellow reefers , I was away from my tank for a month unfortunately when I got back it was A mess I did a water change and cleaned the glass and started inspecting that’s when I saw these things -are they harmful? How do I get rid of them? I currently have no fish and only 2 zoas

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What temperature do you think it too high for your reef tank?

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