Others already gave opinions on things I would take care of, but one thing no one has mentioned is DKH... I do believe 8 is too low, unless you are on the Zeovit (full) system.
If not on Zeo, I would raise DKH to about 10-11... The reason I say this is because I run the full Zeo method, and had my DKH at 7-8 according to zeo recommendations. Well I stopped the Zeolites because I am now running NP BioPellets, but still running all other ZEO. Recently I was seeing some issues and some coral tissue loss, even though everything was perfect. It was brought to my attention that the Zeolites work with DKH, and since I no longer have them, I should raise my DKH back up, so I now run mine at about 10-11 DKH... Almost immediately things improved and now all is good.
Just a thought for you.
Hope this helps!
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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