Bigger never hurts, what is you reactor effluent dkh?

I would bring magnesium up to 1380 to 1400 if I were you, but 1310 is still pretty good.

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It's that caps, I have the same problem with my Calcium because of the caps. They just suck the Ca right out of the system.

I lowered my temp and lowered their position in the tank to slow down metabolism. Now I am able to keep my Ca around 380-400, where as before I couldn't keep it above 320-340ppm.

I have the same problem as you Marie. Top off with a Kalk reactor, Calcium reactor going 24/7, and I can't keep up with it. (I have a 150 full of SPS). They just don't make Calcium reactors big enough. If you look at the common commercially available ones the majority are small and IMO greatly over-rated. I am planning on making a new one but haven't been able to find the plastic I need locally yet... mind you I have only made a quasi-effort.

Where do you get it? Is it finer then the common Aragonite media you can buy at the store?

I think the pics tell the story, the Ca is all in the tank, just part of the Corals now. Good Growth! Do you use a Kalk stirrer/reactor? Making the Kalk more concentrated may help.