Congrats Mike! My wallet hurts reading your thread, nice toys! Your attention to detail is incredible. I had a similar problem with Fritz salt and was told to mix and use it right away and that if I leave mixing the alk would fall even lower than your 6.2 reading. I mix large batches and do auto water change at 6 gallons a day with a Genesis Renew. My water can be mixed for a month so the salt would not work for me. I switched to Tropic Marin and my alk has been very stable at 8.4 and I am dosing 1/3 less 2 part to maintain. I do not understand the chemistry of the alk leaching out of Fritz if you keep mixing, but suspect something similar is going on with you? I would very much like to see all your reef toys in action, I am planning some upgrades shortly and a CA reactor and Alk monitoring are on my list. Awesome build, thanks for sharing!