coral care

So I am new to corals and only have one at the moment, a zoanthid. I am only using the stock LED lights that came with my aquarium kit so I was not going to introduce any corals until upgrading my lighting system at all, but it seems I gave in to try out one that was known for not needing much...

So my tank is about a month old and my clownfish seem to be doing great (they have great color and are very active) also my cleaner shrimp has molted once and he seems to be doing great (moves around the tank a decent amount but loves the middle rock the most). The only thing I think I should do...

ok I tested my calcium on Monday and it was at 390. I tested it today and it was at 410 and I have not put anything in my tank to raise it. I was wondering what would cause it to do that?

I got a bunch of corals from the wwc live sales most of the ones I ordered are doing great but a few, not so much. I'm still fairly new to corals and I have these in a 120 gallon tank I upgraded to this july. the corals I'm posting came in a frag pack so I'm not entirely sure what they are...