Haven't tracked down a pest yet, but two separate colonies had blotchy tissue loss like something was eating the skin off of them and the two colonies went from a few white spots yesterday to 90% tissue loss today. Three other colonies are now showing some white spots. Could also be flatworms possibly.
Tested parameters yesterday and ammonia 0, nitrite 0, nitrate was 0ppm, 0.08 phosphate, 8 dKH, pH 8.1, 450 Ca, 1350 Mg, 35ppt salinity, temp 79. There is a bit of an algae bloom because I started AWC back up two weeks ago after 3 weeks of fluconazole treatment to remove bryopsis with no water changes.
The only things that changed recently was I replaced by GFO and carbon a week ago and did a 4 gallon water change to flush out the fines. Four weeks ago, I grabbed a disney frag and it did the same thing and was promptly removed, but no other corals were affected then.
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