If you care about keeping the lil guy alive (maybe as a sump pet), I would pull the colony and use tongs to chase him to the outside edge of the colony. Once he's clinging to the outside, you can grab him relatively easily - grab and pull him, gently but firmly, away from the gaps in the branches
If not, there are a plethora of dips that will lead to his demise
I kept one alive in a cup for a while. Water change whenever, top up when it gets bad, and he lived on TDO pellet and lived for a few months, molting a couple times, before I went on trip...