[daniella3d]

whoa people...before blaming the salt it must be analysed to see if there is something that can be killing corals.

It could be other things as well. I don't know if you use tap water or if your RODI is a bit old and could be leaching some toxic stuff from the city water? You must absolutely have this salt analysed by a pro lab before you do anything.

I had my tank poisoned by copper and nickel from the kent carbon and the first thing I did was to send a sample to a professional lab and get the result. Kent paid all my dead corals so that's good and I presume that if it is proven that there was something in that salt crashing your tank, then they would give you a compensation. I am surprised that you're the only one having this problem though, and the cloudy water can be a bacteria bloom caused by a fish dying and then ammonia would surely kill your corals and irritate the fish, if not kill them.

Copper does not do this to LPS, in fact, none of my LPS were affected with copper poisoning. I have seen a duncan near death once and it was from too high nitrates.

YOu should first do proper test on your water to see if everything is good, then send a sample of the salt (fresh batch!) to be analysed, then you will know if it is the salt or not.

I have been using Reef crystal for years and never had any bad results, plus it should not be so potent as to crash everything from just a water change, since you're not replacing all the water but just a part.