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Old 12/04/2017, 11:41 AM   #7
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mcgyvr's Avatar
Join Date: Sep 2003
Location: North Carolina
Posts: 17,675
Its hard to tell what all that yellow is all over the skeleton of the coral.. Looks like it might be some encrusting sponge growth which can certainly irritate corals too..
A toothbrush will knock it off..

I'd suggest actively pursuing methods to correct your excessive nutrient levels and worrying about that more than anything else..
"the norm" isn't an optimal environment for stable/healthy coral growth..
Your nitrate levels are much higher than I would recommend for any LPS/SPS corals for long term success.. And your phosphate level isn't good either..

While your duncan may have "tolerated" your less than optimal water conditions in the past it may not continue that trend..

Your lack of proper maintenance and or tank setup is catching up to you..
take a step back and address those issues before anything else..

Being blunt and having fun
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