About two weeks ago I noticed my corals stopped growing. My parameters are right where they should be. Nothing has changed to the tank. The only thing I can think of is, my McCoskers wrasse is gone, again. I think it may have died and maybe it is having an effect on the tank. OR, since it's fall now, our natural gas furnace has been running for 2 or 3 weeks now and maybe that's having an effect on the corals. I also recently cleaned my koralia power heads with vinegar. I rinsed them well, before placing them back into the tank. I should add that two weeks ago, I noticed my forest fire sps and green and orange montipora corals, started to look really unhappy and it even looked like some polyps came off. My acros seem fine though. Any ideas in this? Oh and I want to ask. I use RC salt for my reef. I used to use RSCP, but wasn't impressed at the time. I still have half a bucket of both. Can I mix the two salts next water change I do, or is that a no no?