Hey there Cooltown,There was a misunderstanding along the way in there
I used IO
I don’t know what previous owner used I would guess something similar.
I got it from LFS didn’t want to pay markup on Red Sea need to order some.
I’ve been reefing for 20 years have never heard of salt shock
I really think it was the broken pump that leaked metals into the water change water
looking back should have trashed the WC water
How are the corals doing now? I'm sure after a while they are doing fine, just checking in.
I ran across this video I thought you might like. It's a bit late now with your water changes, but first future reference.