Alright so I got this new emerald crab and saw him starting ti pick at som zoas, i thought nothing of it because they go arond and eat algae wherever. But a couple days later the zoas were gone. So today I come home and see my millipora not looking to good... and my emerald crab is eating its polyps! Please help and tell my how to catch it. I have tried and ended up bumping corals and knocking them down.