HAHAHA... torch corals are the single nastiest coral you can have aside from Galaxia and I have both. I use them as a population control element for my birds nest colony... and another fast growing coral. Its ugly but aside from selling them there is no way around it if your tank is getting full....
One thing that can help is to adjust power heads to get a flow that biases the stingers to move away from the coral its killing. Else if you have room move them... they at least don't seem to kill each other or Hammer corals... but thats about the only thing they wont kill.