I have fragged my colts in the tank many times. I know it is bad form but I did it many times anyways. None of the other corals seemed to mind.
The problem with fragging a colt is not making the frag (easy to cut with scissors or a razor blade) but having the frag attach. Using the sewing thread method I had only a 50% success rate, with rubber bands the success rate was even less.
The best method I have found is the gradual strangulation method using a large zip tie. Over about a week, constrict the zip tie until it is almost closed, then snip of the remaining narrow part of the colt. It is easier to get it to attach this way because the constricted area after cutting will be hard and take a sewing needle and thread better.
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