I have the same coral. Prior to and after getting it I found the following info on the web and it sums it up very well. I have seen the sweeper tentacles extend approximately one inch from the skeleton with a few of them even longer than that at times. Just keep in mind wich way the current will be blowing the tentacles
This is an aggressive coral which will easily damage its neighbors with its stinging sweeper tentacles. The sweeper tentacles are long and deliver a strong sting. Care must be taken in regards to its placement in the tank and the water flow around it as the sweeper tentacles will stretch in strong currents. This coral could do great harm in a small or crowded tank.
Care must be taken in the handling of this coral as it has a fragile skeleton which can easily be broken.
Filter Feeding/Invert food should be offered as well as bits of shrimp, fish, etc.
Lighting: Medium to High
Water flow: Low to Medium
Difficulty of Care: This coral will do well in an aquarium once it is established if you have a healthy specimen. It can be delicate when first introduced because of collection and transportation damage. It is prone to "brown jelly" infections, necrosis, and recession. Be cautious of commensal animals and sponges on the coral as they are commonly found with both in the wild.
