Here's my recent story but witha different type of Anthias, Carberryi.
Bought three. When they got in the display tank everything was initially great. After about a week, one of the three had a tailfin chomped. The only two other fish were a Kole Tang and a Blue-Spotted Jawfish, neither of which seemed to be aggressive. Watched for a bit and finally saw a brief but aggressive chase from one of the other Carberryi.
So I moved it to QT for isolation. All the parameters were good but, all alone, it just hid all day, wouldn't eat well at all, and seemed to be slowly deteriorating. What I suspect is that it was actually not doing well without a "society." Who knows. After about 9 days of that and some minor recovery on his tailfin, I decided to add him back but with three other Carberryi at the same time. My hope was that a larger group would be more "diffuse" and chill.
All six are doing great after about 3.5 weeks and the tail has healed substantially. I did add a brine hatchet and continuous slow rate feeder, which they seem to like (they hang out against the top current waiting for the baby brine to emerge, and chomp then up. There almost seems to be a short of rotation where the last prizewinner turns around, takes a swim to the other side of the tank and back, right to the end of the line. It's not a strict but rather a rough pattern, and kinda cool to see.
So, I took a risk with the whole thing by adding the three new fish with no QT, but this is a temporary 55g while I am gradually assembling a 125g. No corals yet. If there are any health issues, I'll just turn the 55 into a QT and accelerate assembly of the 125g as a display.
Loving these Anthias.
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