I got a bta today and fed him a silverside. My cleaner shrimp stole it! So I gave it back to my bta and kept the shrimp away using a net. After 30 minutes of holding this darn thing I just let the shrimp go. So it went right back to the silverside and started eating it again. I have two questions...1) why isn't the shrimp getting stung? 2) is this a normal occurrence?