Hammar polyp thinning...

Singspot

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Hi There, check out ky video, my 2 Hammars (out of 10) have theor Polyps "thinning". They are both growing very well and happy but for last 3 weekz i have noticed the 2 Hammars (yellow and the lilac/ bleeched looking Hammar) are becoming thinner. ..

My water params
Phosphate 8
Nitrate 10
Alk 8.3
Temperature spiked yo 82.8 F for a couple of days but are fine now between 77 and 79

Does anyone have any such experience, what could be the root-cause and suggested fix?
 
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