I forgot to tell you about my tank. 42 Gallon Hex with 3 h. erectus seahorses, 2 peppermint shrim, 1 horseshoe crab, 3 snails, 25 lbs live rock, sugar-like sand substrate: Temperature 78 degrees, salinity 1.0235, pH 8.0, alkalinity 300 ppm, Nitrite 0, and nitrate is high at 40 ppm. This is...