The stringy brown stuff may be the expelled zooxanthellae from your coral. That would also explain the whiteness of your leather. It appears for some reason to have bleached itself. I'd do a water change and syphon out as much of it as you can to prevent it from fouling the water. Possibly something stressed your system to cause this, so check all your parameters to see if something is out of whack. It may also just be a normal cyclical process that the coral is going through, apparently some do this according to Eric Borneman in his book 'Aquarium Corals'. Keep a close eye on it for a while to see if it improves.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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