ready for SPS...or am I?

[ickmagnet]

So, I tried keeping a piece of cheap sps and unfortunately, it is dead. Strange, because water parameters (including Kh and Ca) appear to be good. I only use rodi water and have ample lighting.

I'm thinking that maybe the chemical warfare has begun between the lps,softies, and the sps. You guys mentioned carbon to help prevent this. ummm..how do I add this exactly? Should I just throw some of that carbon media from freshwater canister aquarium pumps into the sump?