I think it's kind of funny (cute?) when people start dosing, and they say "I dose more and more and I can't keep up." Just keep dosing more. As your parameters stabilize the growth will increase too, so then you'll be behind again. By now you should have a good idea how much you increase the dosing and how much that affects your numbers. Just keeping increasing until you find the happy spot, but continue weekly testing until your tank is full (of corals) and the increase in consumption is less. A growing tank will always have a greater and greater demand until you're fragging just as much as is growing. I can't remember if you mentioned magnesium at all? You're testing that as well, right? You're in the 1300-1400 ppm range?
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Originally Posted by TimT
That might be because either your trying to mix too much bicarb into the amount of water or the water is cooling too much after dissolving and the bicarb won't stay in solution. I find it works better if you warm the water to about 80°f. I mix at a concentration of 86 grams sodium bicarb to 1 litre of water. I stir it for 15 minutes to make sure it's all dissolved.
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I do this too, except I use a MJ400 to do the mixing. Using warm water makes a big difference when mixing sodium (bi)carbonate.