Yeah, I'm not saying that the chemical treatment wasn't the cause of the death, I am just wondering if it was chemicals + large water change.
Is it routine for you to do 50% water changes? In other words, would a 50% water change be a departure from the norm for your tank inhabitants? Maybe this is irrelevant, don't know, but curious.
The reason I ask is b/c I do 50% changes every Sunday, and my ottos are fine. BUT, looks like it is wise to tread lightly on this protocol
I do a 50% water change every Saturday. When I clean my canister I will often do a 75% water change and the inhabitants have never shown stress. I dunno it may have just been a fluke.