Well, I'm still not sure what killed my colonies, but I know it wasn't chlormines. I called the city and was told that nothing has been changed lately.
However, the RTN seems to have stopped. My remaining colonies look fine, and are doin will. I ended up losing a total of eight colonies all together. They were a Hawkins, Purple Slimer, Palmers Blue Millie, Crayola Plana, Blue Tip Bottle Brush, Miami Orchid, Pink Lemonade, and a Blue Tip Green Table. My Red Planet, and Green Birdsnest look terrible, but may pull through.
The only thing I can think of was the temp. I use fans that were timed with my T5 lights, but have since put them on full time. I also noticed my TDS was at 3 PPM, so I changed my DI resin. Neither one of these things should have done what they did, but maybe together, the corals just got too stressed, and couldn't take it. I'm still a little baffeled though. I have never seen healthy SPS melt away so quickly, and in such numbers. There were no indicating signs at all. Everything was happy, then all of a sudden, Bam! Eight colonies were completely dead within 48 hours.
Well, I suppose on the bright side, I now have some room again in my tank to start working on my wish list again.
Thank you very much to all who contributed on this thread. I really appreciate it. I wish I could tell you what happened for sure.
Thanks Again,
Ski