So my tank was thriving all my sps was encrusting and growing quick. Then out of nowhere everything began to die. I was thinking it was a alk swing from a big water change but then a few days ago I was installing an upgrade kit for my RODI unit. A double canister DI with a TDS meter. Realized that the Water coming into the double canister was at 27TDS after passing through the entire 4 stage unit. Looked and realized my canister of DI was upside down. Ran my tank with that water for months. Had a hand held TDS meter that only ever read 2-4tds. I’m thinking this was my issue