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The back of the tank is open so it should be ok with heat, but the feet on the pump may not be enough to stop the vibrations. If it gets bad, you can try adding a piece of coarse filter foam underneath it.
The emerald crab shouldn’t bother corals, they’ll pic algae and scavenge but that’s about it. I have one in my tank for the longest without issues.
The 1st n 3rd pic, the corals are definitely bleached by something. Maybe the peroxide made direct contact with the corals??? The 2nd pic looks...