I actually used the narrow glass leaning up against the rock trick. I had one evil large black crab like that in my 230 that I battled with for about 6 months and finally caught him in a coral that wasn't attached and lifted coral crab and all out of the tank. That was after trying everything - glass, plastic bottle, shish ka bob spear (don't try that one I almost went swimming and managed to fall of the stool I was standing on).
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