My Alkalinity is High

[Josh23]

I just tested my Ca and found that is was at 230 which is a 50 point increase since last week. Its moving up but I have a little to go before I hit 400.

Once I hit 400 do you think it would be possible keep some corals in the upper part of my tank even though it is a 50 gallon tank lit by 2 NOs.
If this is possible could you list a couple possibilities.
Ie. mushrooms etc.

Thanks
josh