I remember when my tank crashed a few years back, I lost all my plecos but 1. Lost all my danios. My cories and Clown loaches were untouched. I could not not explain what happened.
Same as always did around 50% WC not sure if it was chemicals or what that did then in. I got to do a WC on my other tank hope nothing is really in the tap. Oh and as far as money spent a bit over a grand