Why is my Colt Coral Dying

My Colt Coral has been looking very sick for about 2 weeks. I know that it started when I dose too much Mg and raised it up to about 1500. Since then I have kept my Ca in check and also 2 water changes of 7 gallons. The symptoms are very retracted polyps and trunk, with a deep purple color.

I know how you guys are about pics and parameters so when I get off of work I'll post both of them.

 

what type of fish and inverts are in the tank? have you noticed any of them nipping at it? you dont have a angel do you?

 

Yes, pics will help. Not sure about the Purple color. It is probably reacting to the parameter change.

 

it's not getting blasted with current ? :-/

 

also how is other coral reacting and how fast did you adjust your params?

 

Pictures by carpenter1976 - Photobucket

Sorry for taking so long, here is a link to several pictures I just uploaded.

 

1 Cleaner Shrimp, 2 Blue Chromis, 1 Yellow Tang, 1 Foxface, 1 Cinnamon Clown, 1 BTA, 6" Frogspawn, 6" Branching Hammer, 6" Fox Coral, Bunches of Mushrooms.

I haven't noticed anyone nipping at it.

 

I tested a few parameters:

KH: 6
Temp: 78
Ph: 8.3
Ca: 420
Mg: 1420 Red Sea Test Kit
SG: 1.023 ATS Refractometer

 

Your kh should be between 9-12 magnesium shouldnt do that.Maybe to quick of a jump will but I havent had that happen and I've brought mine up 200ppm in 3 days.I can tell when my kh drops because some of my corals will get wimpy looking.

 

Here are my params as I record them on each date. I only noted the changes after 1-16-2010 if there was a change.

Jan 16th: Temp 78 Ph 8.3 Ca 400 Mg 1280 SG 1.027
Jan 24th: Ph 8.0 Ca 420 Mg 1420 SG 1.026 KH 6
Feb 9th: Ph 8.3 Ca 380 Mg 1540 SG 1.027
Feb 22nd: Ca 420 Mg 1420

I added 29/mg of Tech M on Jan 16th.
I added 17.75/mg of Liquid Calcium on Feb 9th.

During this process the shrimp molted once, I don't remember exactly but it had been 3 to 6 months since his last molt. Also the tentacles of the anemone have seemed less active.