Ok. Dumb move of the night...I don’t have my ATO hooked up yet. So every other day or so I just fill with RODI straight from the system. A gallon or two is no big deal. Well. I let it run too long and forgot to set my timer so it got quite the fill. Salinity is fine.
Saw 2 of my Corals all *****. Temp in the tank was 76 degrees!! Thought my heater was broken until I realized I filled about 15 gallons of RO water that was cold!!! Ugh. Thank goodness the temp wasn’t too significant. They should be back out tomorrow. But they were not happy! This weekend the ATO is getting hooked up!!!
(PS - the amount of evaporation of a completely open tank with a 100 gallon open sump is HUGE!!!). I bet I lose 2-3 gallons per day!!!
Get the new DI membrane that produces the pre-evaporate water, in that case your water won't evaporate as much.
Btw, yes I'm ok