Hey everybody. I have had my tank set up for around 2 months. 0 ammonia, zero nitrites, 2 nitrates. I have a few small fish in there, a small zoanthid frag, a small leather coral frag, and I had a small acan coral I added about two weeks ago. Things were going great with my acan until I did a 20 % water change yesterday and this morning my acan was a goner. I’m trying to figure out if me possible accidentally blasting the coral with new water could’ve done it? Can that kill a coral outright? I know it could be nearly anything that could’ve killed it, but my parameters seem in check and my other corals that requires presumptive similar lighting and flow have been doing great and growing. I matched my water the best I could that I changed. I just can’t think of anything else.