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bertoni · 09/13/2018, 09:36 PM

Running carbon generally won't affect those levels any appreciable amount. If the carbon is becoming coating with white rock and turning solid, there might be something of an issue there.

Is the tank getting anything in the way of pH buffers or tap water? Those are the more common sources of alkalinity.

All that said, those numbers are fairly close. Which calcium kit are you using? If it only has 25 ppm resolution, the calcium numbers actually are very close. I might dose the level up to 400 ppm. I'd do that in two shots, and I'd measure a few minutes after dosing, to make sure that the dose is doing what you expect. There's always some chance of a bit of an error in mixing the solutions.

09/13/2018, 09:36 PM	#2
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 88,616	Running carbon generally won't affect those levels any appreciable amount. If the carbon is becoming coating with white rock and turning solid, there might be something of an issue there. Is the tank getting anything in the way of pH buffers or tap water? Those are the more common sources of alkalinity. All that said, those numbers are fairly close. Which calcium kit are you using? If it only has 25 ppm resolution, the calcium numbers actually are very close. I might dose the level up to 400 ppm. I'd do that in two shots, and I'd measure a few minutes after dosing, to make sure that the dose is doing what you expect. There's always some chance of a bit of an error in mixing the solutions. __________________ Jonathan Bertoni