I have a frag of zoas that was growing really well. Today one was closed up, and I noticed what I’ve identified as zoa pox. I’ve read a lot of speculation online, but haven’t found a direct answer. Is zoa pox contagious through the water, or is does it have to be touching another colony? I did remove the zoa frag and have it in a container, but due to my work schedule, it’ll probably be at least another 2 days before I can get Furan2 for treatment. I also have a good amount of zoas from TSA “beat the rush” event arriving on the 1st. I did read speculation that pox is caused by a change in the water column. About 5 days ago I did a water change; guess I took out too much bacteria, because the next morning my tank was cloudy and brown. After a day or two it cleared up- could this change have cause the pox? Are my other colonies in danger? Sorry for the long message. I would appreciate any advice!!