I noticed after this weeks water change my calcium levels are at 380 instead of the 400 it was 2 days ago. I do a 3 gallon water change on my 36 gallon cause I have 30 lbs of sand and 30 of rock so I figured it was enough. Should I start dosing for just 2 lps or maybe do a slightly larger water change? I'm just scared that with dosing ill freak out the coral and they'll die or something.