Welcome to AquariumAdvice Black96
(I hope the rest of your stay here is a bit more welcoming
I can confirm the shock from change bit. I had been using Crystal Reef from day one on my tank and things were doing fine, doing well even. I only have a few shrooms
and some SPS
hitchhikers that were about 1-2 square inches each. I came across a great deal on a bucket of Coralife salt. I had a bit of a brain fart, and the next time I did a water change I just used the coralife as I would have the Crystal Reef. Nothing died but boy did they react! Shrooms
are notoriously difficult to kill but I swore I was going to have to yank the whole colony. For about thext month they hardly opened at all! My SPS
colonies were practically unseen as well. i tested my water just about every other day and all measurements came out normal. I didn't know what to do but realized what had likely caused the issue So I hoped that simply giving them time to adjust was all they needed and preyed they would make it.
Well it's been another month and things have returned to normal. The shrooms
are in full bloom again (and i think the darned things are starting to split again!) and my SPS
hitchhikers are back to "normal" I could tell you what they were, if i knew lol.
So, in summary, yes, changing salt brands may
lead to a shock. But if you acclimate the tank to the new chemistry you shouldn't have any problems.