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I guess I'm the exception to this rule. I've now kept my group of 12 for over a year without a single loss. I auto-feed 4-5 times a day, and they're all fat and happy. The male and original 5 females have been together now almost 2 years. I did lose several to acclimation/disease, but never aggression.No anthias is easy. Some are just easier than others. Keeping a single is generally met with greater success than trying to keep a group. No matter how many you buy, eventually you’ll end up with just one. You can mix species. I have a single lyretail and bimac in my 120. Thinking about adding a single Bartlett. I started out with 5 lyretails six years ago, now down to one.
I think a key part is keeping enough so that the aggression and thus stress is spread out a lot more. Keep in mind that the M:F ratio for these fish in the wild is like 1:35.