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If you see a deep hole in your sand and he's sitting in it, move him somewhere else. That means he's been trying to propel himself somewhere else and cant blow hard enough to get out of the hole.
Hang in there, keep up on the water changes, and don't add anything new to the tank.
I had high nitrates when my sump was full of rock too. It took a month later for my perimeters to get down to normal after removing most of the rock.
Did you try leaving the vinegar on it soaking then scrape it off?
Same thing with the overflow. Let it soak.
The white Coraline will fall off eventually. It is not harmfull.
I can reseal it for you if it makes you feel more comfortable.
Copied from Charles & Linda Raabe from the Philippines. Link
http://www.chucksaddiction.com/coraldisease.html
Treatments: Note: All treatments should be performed outside of the main aquarium in a quarantine setting.
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