Having issues with 125 gal tank

[USNDoc]

Everything g was going good four few months few tweaks here and there as we all do... recently I had been working in mr room where tank is and had kicked som e cement dust in the air and it coated my tank and got in tank even though it's covered and encased

I noticed a nitrate spike immediately before putting in second bottle of drops it was orange
ammonia was between .25-.50
KH 7
calcium was 560 ( yes little high it's coming down)
ph was 8-8.1
nitrite 0

Added in Amquel the past few day things started coming around I know I los about my domino damsels and pseudochromis ok no problem. My coral beauty angel seem th do alright and the yellow fin damsel is fine but but regal blue tang just can't ntinues to hide ate 2 days ago But not active. CURRENTLY no one is eating the PURPLE Kelp but are eating frozen Brine

I did a water change and nothing floating mon water cleaned out filter Skimmer etc


The regal tang is not looking good in my view. Any advice ?

V/r
James


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[Saltydoug]

I would keep doing as many water changes as you reasonably can.

 

[CAPSLOCK]

^That, plus vigorous skimming. You could also try one of those poly filter pad things to remove any crap the cement dust may have gotten in there. It'll remove all sorts of contaminants.