Hi all! Just a bit baffled and thought I’d turn to the forums. So I’ve had varying colonies of zoanthids in my tank for quite some time now, but recently upon adding a new colony to the tank after proper quarantine, many of my well established zoa colonies are beginning to turn a brownish black color. I initially thought pests so I did a fresh water dip that didn’t seem to help much, nothing appeared to be making a snack out of them. So I turned to lighting as a possible culprit. I dimmed my lighting about 5% across the entirety of the day with no positive results. Any ideas or similar circumstances??