Acan colony on live rock

[Palmer]

Mines about the size of a fist and just bulges out slightly on part of the rock. I am taking down the tank and not using the rock in the next tank but want to frag the acan off. So I would need to break the rock itself or cut into the colony vertically from above? Thanks

[Skimmer Juice]

you could also take a chizzle and hammer , chip the rock around the acans rock breaks pretty easy that way