Reactors and Additives

[DJ88]

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I haven't add Calcium to my system for a very long time. So I am either not consuming calcium (at all) or my reactor is working. So far, my SPS are growing and my coraline is spreading. So...it must be the reactor is working

I think you are consuming very little Ca in all honesty. If any at all. And if that is the case(which I suspect) your Ca reactor is doing nothing other than acting as a water circulation system. The main indicator for this is the fact that you have to add Buffer to your tank to boost Alk back to normal levels. That is a warning sign from your tank that something is not right. You may want to heed it.