Aye that’s good! I would test once a week to get an idea of yr weekly consumption of alk , but 11.5 is quite high but still in range of 7-12. I would let the nitrates rise a bit , I run mine 20-40 ppm but sps enjoys lower nitrates. One problem of high alk / low nitrate is the stony part of sps grows but the flesh doesn’t due to lower nitrate. I think I’m experiencing the opposite of that with high nitrate and lower calcium lol despite dosing daily see my torchSo....this old reefer finally invested in the Alk test kit lol. The few SPS I have that require moderate to lower light are doing ok slow growth not dying except the birdsnest that got hit back in summer when my AC failed, but wanted to get a handle on what we have. 11.5 DKH? I don't dose, and as many know very minimal filtration mechanical. My Nitrates at 12 tonight, typically 10-15....I have read in higher nutrient tanks the Alk holds pretty high? I do 3-4 gallons a week change on this 90 system, just to bump the elements a bit as needed....thoughts? Doesn't seem I need to dose whatsoever, Mag is always pretty high too.... @dvgyfresh , @Rmckoy , and particularly @Tamberav , and @Timfish ( you both run similar tanks in some cases to mine)... any thoughts appreciated. Keep doing what we're doing?