Instant Ocean Reef Crystals crashed my Tank!
 

After a regular water change using the Reef Crystals salt, all my fish died. I was lucky enough to notice and took most corals (LPS) out. Please be aware of this salt, so it does not happen to you. I went back to the store and changed the salt water, but it was too late for my fish.

How did it crash your tank? I find this highly unlikely the salt crashed your tank, care to explain more?

Ditto. I've been using Reef Crystals for years without an issue.

We're you using RODI or tap water? If tap, the city could have added higher levels of chlorine or chloramine if its been raining hard in Calgary and the waters are turbid.

I only use reefcrystal and have been for 8 years with no prob. did you mix up the salt but even that wouldn't affect the fish.

I am using RODI water and have been since I started my tank. I ran out of my salinity salt. I tried using reef crystals, and mixed my salt with RODI water, left mixing for two days. Reached salinity level 1.025 (same as my tank) and same temperature. Tank was doing really well prior to water change. And after...... the tank crashed. I got some salinity salt fron my brother in law and within a few hrs i saved what corals i could.

Any possibility that something may of fallen in the saltwater mix during those 2 days? You got kids? cleaning lady ? smelly aerosols automatically perfuming the room? that stuff can kill a tank

Even if it had been a bad batch, all the forums would be getting complaints by all the people who would have purchased the bad batch. I very much doubt that you would have been the only one getting a bad batch.
Salt mixes are often used as a scapegoat for things that go wrong, when it fact, at worst, it is only a coincidental occurrence.

It might have been that you switched salts.
The parameters for Reef Crystals may be different from the parameters of the salinity salt even if you have the salinity at 1.025.

I've read somewhere before that changing salt may not always be a good idea.

Well i did think about it, but im pretty sure i did the same steps. Took the same precautions and the only different step was the salt.