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[TanksAlot187]

My 75 reef has been doing great up until a few weeks ago cherry tree monti stared to lose it color and green slimer started to slowly die along with my chalices I have been checking all my basic water perimeters seem to be normal have done a bunch of water changes still having trouble figuring out what’s going on any ideas

 

[The Aquatic Arsenal]

Have there been any changes to lighting or any other changes? What have your phosphate levels been?

 

[TanksAlot187]

Have there been any changes to lighting or any other changes? What have your phosphate levels been?

Phosphates have always stayed at O
Lightning & schedule has not changed
Added another mp-40

 

[Wolf89]

ICP test, you may have a source of metal that's leaking into your tank somehow

 

[vetteguy53081]

PH and Alk likely low and also VERIFY Salinity

 

[W1ngz]

pH is falling below typically acceptable ranges. Confirm or recalibrate the probe to make sure that number is right. If it is you need more fresh air into the skimmer either by opening windows, bathroom fans on 24/7, CO2 reactor or skimmer air line outside.

We need a full list of parameters please. With SPS nitrate and phosphate are important.

You need a low-range phosphate checker to determine if that's actually 0, or just below what your test can measure. Liquid tests cannot measure in the ranges that you're interested in.