A few months ago I put 4 peppermint shrimp in my 90 gallon tank. They made quick work of the aptasia and I had a problem since. Then I went on vacation for a week. When I got back, one of my BTA's was gone! I mean there was no trace of it. It was a medium sized anemone (4" long). Then I heard that peppermint shrimp will attack anemones after they have eaten all the aptasia. Is this true? I have noticed that a couple of the shrimp are now hanging out right near the remaining BTA. There were no signs of trouble before I went on vacation ( and I had been aptasia free for 10 weeks at that time). It seems unlikely that the shrimp could have eaten that much anemone in a week.