Make a trap out of a 20 oz soda bottle. Google homemade fish trap it will show you how to cut the top, then bait it. Cheap and it will work. I have used this on my 110 gallon for the same use. If you trap the wrong fish, just simply let it go until you get the damsel.
Or, a very small hook and line. If you like the fish, remove the barb, if you REALLY want it gone, don't![]()
lol, has anyone ever actually done this? I do have small hooks that would work.....