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[APD] adding Calcium Carbonate

I have extremely soft water, and have been having problems with calcium deficiency. I purchased some calcium carbonate from the local beer brewing store to add to the tank. The problem is that when I add it to the tank, the extremely fine grained particles go into suspension and take a long time to clear. The tank is cloudy/milky for a day or so, then hazy for a couple of water changes.

While it is amusing to watch the currents transporting the stuff around until the tank is a solid white, that gets old soon (I'd rather look at the plants and fish). Any ideas on ways to add a fine powder without creating a snowstorm?

I'd prefer to add it to the sump, so that there is plenty of water flow to help the dissolving...

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