High Magnesium question

So lately Ive noticed some of my sps colors are fading, and my large green birdnest colony looks like its dying.  After getting a new test kit(salifert) I tested and my mag is very high, way above the reportable range on the kit. It seems my last test kit was bad so I kept dosing it.   Im wondering if there is any correlation between the two.  Is there any bad side effects from having a really high mag?  I did a 25-30% water change last night to try and help bring the levels down some.  My parameters are as follows:

Edited by kellerexpress - May 24 2011 at 4:23pm

I had my mag up to 2000 when I was dosing it to kill of Bryposis. I did notice colors start to fade and look washed out. This lasted the whole time I had it that high. When I brought it back down to 1500 the colors came back in a few short weeks. I'd just let it come down naturally and you should be fine as far as colors go. The birdsnest colony you may want to frag, in my experience when birdsnest start to go they really go. Also I noticed that you have the salifert kit now? You can totally get an accurate reading even if it's too high and uses the whole syringe . . . Just fill the syringe again and keep putting drops in. When it stops just add the full syringes level and the new syringes levels together to get your total mag.

Edited by jwoo - May 24 2011 at 3:47pm

My hubby accidentally poured a whole gallon of Mag into our old 40g tank (he thought it was RO/DI topoff water).  Granted, it was a quick change that could've affected the corals more than just the magnesium itself, but still.  I don't know what our Mag got up to, but the effect was pretty much what you described.  Washed out...birdsnest went first.

Ya its funny, its usually one of the most hardy sps Ive owned, till  this happened