I just tested my Kh and it's reading around 100- 105 mg/L.....is this level acceptable?? The reason I ask is that I have high calcium readings right now and I haven't added calcium into the tank for over a month now. We do a 10 gallon water change every week to a week and a half for our tank and use Seachem marine salt. Our tank is also stock with 1 clam, and 5 acros, 4 frags and some lps in there too. I would think that the calcium level should gradually start to decline but it has been this way for the last month. Anyone know why?