Does anyone know me have a large shoal of damsels ?

[SeaHorse_Fanatic]

In the wild, they shoal to confuse predators. In a reef tank, they will usually become territorial and bicker with one another rather than shoal since they have little to fear, so it becomes survival of the fittest, rather than a more communal "strength in numbers" and "confuse the predator" shoaling behaviour.

[albert_dao]

I had like 30 Dascyllus reticulatus in a 230 for nearly a year before a velvet infection wiped them all out :_(

You really have to house them with big, intimidating fish to keep them in line, otherwise breeding pairs bully the others until you're left with two animals.

[target]

I've got a azure damsel in my sump you can have. He and a lemon damsel are responsible for wiping out every other fish in my tank. Maybe a group will be better.