Corals Dying-plz help

What are your parameters?
How long has your tank been up?
What else is it stocked with?
Do you have a picture of the entire tank?

We will definitely be needing more information to help effectively.

I'm not an expert but i had the same thing happen to me a while ago when I first started. it was when I first started and I found out after the fact that my lights were the problem. I didn't realize that the bulbs were working fine except they were 18 months old. just a thought. 

From experience I know SPS does not handle vitamin c dosing, I lost SPS when I dosed vitamin c.

I don't know if it is just that but I had that problem, I only dosed a couple times and it took out my SPS:( however please post your full tank pic as I am guessing there is more to it.

i dose vitamin c frequently and have never had a problem what kind of v-c are you using? you could use calcium chloride to buffer the alk. i've used some kent products in the past with varying results.

Yes, I will come up with a whole tank pic tonite.  But for now..here is my tank @ nite couple months ago.  FYI, that brain coral is alone by himself.

Yes Mark, I was caution try not to overdose it.  The Kent Marine Superbuffer dKH (dry/powder supplement)  is the one I have been using.  I mix every 2 tsp of it with 2.5 gal for the topoff water.  For the A&B, 10ml each every 3 days.  As we speak, that SPS is totally turning white now...It not only adds an unique color in my tank but also adds a great heaviness sorrow in my heart.

FishnFriendz wrote: Yes Mark, I was caution try not to overdose it.  The Kent Marine Superbuffer dKH (dry/powder supplement)  is the one I have been using.  I mix every 2 tsp of it with 2.5 gal for the topoff water.  For the A&B, 10ml each every 3 days.  As we speak, that SPS is totally turning white now...It not only adds an unique color in my tank but also adds a great heaviness sorrow in my heart.

Yes, it can be very sad to lose animals. Leave it in the tank though. Sometimes, when water parameters are brought back in range coral come back from the dead, so don't brush any more skin off the skeletons.

Alkalinity Testing is how we know how much Alkalinity to add to our tanks. The Alk needs to be around 9-10 dKH. Ca is within range (350-500 ppm) so the dosing of that supplement can be maintained or even decreased a little.

The Kent Marine Superbuffer and the Kent part B are doing pretty much the exact same thing, adding Alkalinity. To get the Alkalinity up, I would double the amount you have been adding and if you don't have test kits for Alk and Ca, I would strongly advise you to buy them.

Eventually you will run out of the Kent products and need to buy more. Those additives are essentially Baking Soda & Washing Soda for Alk and Calcium Chloride (Ice Melt) for Ca. There is more on this in the Reefkeeping Tips Thread

Wow- you have rapid tissue necrosis on your SPS and no one suggested to start fraggin?  If the tissue is receding rapidly, it is always advised to frag off any good parts left and remount, or else the whole coral is lost.  Low alk and alk swings may likely be your issue, but it is hard to say without further information.  If you have good parts of coral left, I would suggest fraggin them to save those pieces, however small they may be.