I'm sorry but I have to say it. Noones gotten a bad box of salt before? I guess it comes down to how long you've been in the hobby, ontop of that the amount of salt you go through. I've known Rico for over 6 years, a 10 percent water change isnt going to crash your tank. I've totalled 4 boxes 3 buckets of extremely botched salt since I setup my red sea reefer in sep 2015. It's all documented on my build thread
About 3 months ago, over the course of a month, did about 5 20% water changes on my system. "Usually" when I buy salt, I'll get from 3 to 10 boxes at a time with the same batch number just so I dont have to test everytime I open a box. Salt was mixing cloudy, put that aside and decided on doint WCes anyway. Let's just say the majority of my corals turned or started turning white in about 2 weeks. For zoanthids to bleach and not melt in 2 weeks time is a big deal. Im talking turning bone white. Decided to test the salt because I started slacking on testing a fresh box for about a year now.
The salt mixed up @ 36 yet the calcium was under 350 and mag was under 1,100. Wouldn't be suprised if it was just table salt (plain sodium chloride) if you asked me. I swapped a out 100percent of my water with table salt and my tank never crashed.
Rico was not wrong for putting that out there, he said this started happening before he did the water change. People just take stuff out of context, and made it wrong. When it's not uncommon to get a bad batch of salt. There's been plenty of times fish of hex, whoever had stuff fail on them. You don't see people going out and making post about them.
I quit doing livestreams because people started promoting products, and instead of answering a viewers question(about a competitor) they couldn't speak because w.e company promoted them- wouldnt allow them to talk about a competitor. This is about 70 percent of the people you watch on YouTube. Rico isn't one of them.
If your having issues with a product, it's best to share your thoughts and opinions so one can be prepared, for better or for worse. The entire hobby was built on experience, and it will continue to be that way.