Starfish eating soft corals need help

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Venom SS

Jack Dempsey
MFK Member
Aug 14, 2008
1,429
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Texas
I recently noticed that the green button corals I recently got where starting to get kinda bleached looking. Was told that this type of coral is strictly photosynthetic and need no plankton supplements. I had been told wrong but not the problem. I turned the lights on and found a small long armed white starfish munching on my coral.

I guess what am getting at is an ID and how to get rid of the creature. It is small, maybe an inch across. It is bright white and has long skinny legs, and moves very quickly. I tried to grab it with some forceps but it quickly ducked into a crevice. I cant use predators to get rid if it, I have a large smasher mantis shrimp that wont allow much of anything else in the tank. Any info you guys have would be appreciated.
 
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