You can often grab a hold of them and pull (peel) them off the rock, foot and all. While the cutting technique will slow their spread, if you leave even a small section of the foot on your rocks they will grow back unless you cover the left over foot with kalk paste.
you can also use your teeth to trim
Great aftertaste also! Is there anything in the world that stinks worse than xenia?
you can also use your teeth to trim
Wish i had that problem.