How long can it take for sps to color up, generally? I haven't noticed anything positive in that regard since stabilizing my system 6-7 weeks back. I was dosing amino acids, but stopped after not seeing any improvement and fear of nutrient issues. Phosphate is extremely low (.003 ppm) and my other parameters seem spot on ( calc 430, alk 3.6, mag 1380, SG 1.026, nitrate 0, pH 8.2). temperature fluctuates 1-2 degrees a day. Light cycle is 9 hours (light spec in signature below). Everything is stable and has been for 6-7 weeks now. Do sps typically begin to color up after establishing a strong base first? I'm seeing rapid encrusting right now, do that's good. I havent had any coraline growing in months. I wonder if that issue is related somehow?