Chalice Corals

[Aquatic Hamster]

How close can chalice specimans be placed to each other? I've had one that is showing steady growth for about 6 months now and I just pickup a small frag of alien eye in a trade. I've noticed the one I've been raising for awhile has some good sized sweepers appearing after lights out.

 

[Aquabucket]

Thats a great time to feed them! My pink and red chalice has doubled its size in 6 months. The sweepers are about an inch long so they are not much of a threat IMO. How long are yours?