Reverse Superman Monti

I'm going to say the lights had a lot to do with it. Depending on where you were at under the sols you can bleach about anything.
I think you're also making a lot of pretty drastic changes to the tank. Lighting, scrubbing rocks, adding GFO. you already know your water quality isn't that great.
I don't even recommend wasting test solution checking for calcium, or mag, or anything like that right now. I would concentrate on getting the tank stable and don't even bother with the hassle of dosing anything for alk, calcium, or mag. I'm going to bet you don't have anywhere near the coral load that simple water changes wouldn't provide everything you need and more for those elements.
Step one Get it all cleaned up. Let your GFO work, continue frequent water changes and let it stabilize again. Don't worry about anything else but water changes, GFO changes and getting the water quality where it should be.
Until you get step one done, I wouldn't even attempt to add any more corals.

 

I would not really call those OK at all.


Ca is off the charts high. Are you dosing anything? What salt are you using?

Alkalinity is off the charts high as well.... you have to be dosing something....? That high of alk could burn the hell out of corals as well.

I assume you meant NO2 = 0 and NO3 = 20 since you said you showed nitrates. I would say if your nitrates are indeed only 20 that is the least of your worries.

any ammonia is a bad thing.

PO4 1 is high, but you already know that and are running GFO.

SG is a little on the high side as well, but nothing detrimental if that number is accurate. Are you checking with a refractometer?

 

1.026-1.027 is fine, IF its accurate, but being you're checking with a hydrometer that accuracy is questionable.


check out this link for the best ranges to shoot for.


parameters