add lots of corals or calcium eating macros to lower calcium....it wont hurt any of your corals/livestock if its high but if it hits i think 500 and higher you could start getting calcium build ups in pumps over time but nothing to be worried about urgently as long as it isnt like that for a prolonged amount of time
Calcium usually forms precipitate around the edges of your tank, or it can form coraline algae. Other than that, get a clam. It will drain the calcium out quick.
i have an american marine pinpoint dual stage controller with the temp probe. its a few years old was only used for about 3 months until i bought an aqua controller for my system.
problem is I'm in central jersey. I'd sell it for 100 shipped. pm me and i'll give you my number if you're interested.