Corals Dying - Calcium

[Seriak]

Okay many of you know that my corals started dying on me around 4 months ago. At that time, I had started doing 3 different things.

1) Added a new MP40
2) Introduced Bio Pellets
3) Started to Dose Calcium.

I just couldn't figure out what was going on until recently my calcium ran out and I didn't bother changing it for a week. During this time my green film algae started to disappear and my LPS started to puff up again. I hadn't put 2 and 2 together yet so I filled up my empty Calcium jug and bang my algae started to come back again and my LPS started to shrivel up again. So my question is this.

What about my Calcium can cause

1) excess film algae that covers corals and rock
2) stress out LPS so they drop their heads

I have talked with the Calcium supplier and there has been no similar complaints, so the belief is that the Calcium is fine. I typically put the calcium in a jug with some RO/DI water give a few shakes and put my dosing tube in it. I dose 3 times per day for 40 seconds.

My parameters were as follows.

Ca 470
Mg 1300
Alk 7.8
PO4 .01
Nitrates 10ish
PH 8.00-8.13