02-09-2009, 11:23 PM
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For the record Mike, I have found it a bit more difficult to maintain proper levels in a tank that has little uptake of calcium/bicarbonate. My 75g is spot-on, I dose B-ionic 2-part 20mL daily with Limewater top-off. I do not dose any Alkalinity buffer other than the 2-part. I dose the b-ionic 2 part with the focus on the alkalinity levels, then adjust the calcium with Kent Marine Liquid Calcium. my last test showed Ca at 480, alk at 11dkh. In the system, I have an abundance of soft corals, some LPS corals, and a few SPS corals.
My wife has a 55g with 4 RBTAs and one green, where the levels have been a bear to keep in check.
As for the Nitrate levels, how old are your test kits? Most kits have a shelf life of about 1 year. I use API test kits and I can tell you first hand that as the API Nitrate test kit ages, it gives off unusually high readings. I had a 2+ year old kit that tested at 20x the actual measure.