Any fool proof way to catch two convict blennies!!

I've had small fish disapearing for some time now. I can't keep any kind of shrimps' whatsoever, I blamed it on the 6line wrasse and figured I'd have to wait til it eventually died, well, come to find out, by sitting here late at night with just blue moon led's on, it's my convicts!! They are about 8 or 9 inches long, 2 years old now, and they always seemed to me as passive, but they are not at all, they chase and grab smaller fish, will even grab my hertmits and try and throw them from their shells. It's like a horror movie. lol Any ideas how to catch them safely? they are destroying my display also, every other day some rock has fallen and upset a piece of coral. I learned after I had gotten them you were suppose to put the rock directly on the bottom but a little late for that now with all the coral I have.

 

Get a fish trap and bait it.

Its not Droid, it's me fishies.

 

I made one I saw on you tube with the soda bottle, man, it worked all right, one got in and man he swung that bottle around in the tank, made a big mess of water on the floor and he got out. that one is scrapped up pretty good though. I just looked up a fish trap, had never seen one before, neat idea, will only work at night but worth staying up for! thanks