Feather duster rock

[megadon]

I picked up a great piece of rock with about 15 feather dusters in it, they all have multiple crowns with many different colors, the first day they cam out constantly, a day or 2 later they aren't coming out anymore. I have 2 cleaner shrimp, a Cherub Angel, Black Clown, a 6 Line Wrasse, and an Emerald Crab. I haven't seen anything bothering them, do they like a lot of flow, or lower flow? Thanks.

 

[megadon]

Anyone have any thoughts on this?

 

[7days]

I have a bunch of feather dusters on my lr. Not a lot of water flow, and only snails and starfish to bother them. They stay open almost all the time, UNLESS I hit the tank or the inverts get close to them. I am not an expert however, this is just my experience. By the way, they have been growing since the rock was introduced.