It's just because there's multiple species and there's too much differing information on how to tell them apart... I have them and I have seen them just mercilessly attack a new zoa frag. Like all converge on it. Yet I have vast colonies untouched by them. So it clearly varies by asterina species and zoa species.I used to listen to this advice, even when I watched an entire colony of Ompa Loompas shrink to nearly nothing.
Then I watched as Asterina took out 5 of my Great Owl zoas…
I no longer listen to this advice anymore.
That’s some serious $$$.