Ok, so Monday my calcium was about 300 ppm. I'd just bought the API reef kit that day, it hadn't been tested before then. After much online research I determine that I needed to dose the tank (14g biocube). On Tuesday I picked up some Kent liquid calcium & 2.2 gals of Nutri-Sea water. I was going to get a Mg test kit too but the 2 stores I went to didn't have them. Anyway I did a 2 gallon water change then went to pour a couple drops in and ended up putting in about a teaspoon or more. Didn't think too much of it. I get home from work tonight with a new Salifert Mg test kit I picked up at lunch and test both Mg and Ca. Mg is 1200ppm and Ca is >20ppm. I tested the Ca twice thinking maybe I did something wrong. I finally put 2 and 2 together and realized what I'd done. You can see a dusting of calcium all over the tank.
My calcium is down to almost nothing, and my PH is down to 8.0 from 8.3, everything else is about the same. Ammonia, Nitrite, and Nitrate are 0, dKH is 16, Phosphate is .25ppm. 2 Clowns, Hermits, and Snails seem OK, corals don't look too happy but not horrible.
Question is... What now? Water change? Start dosing again using CORRECT amounts? Something else?