Well, its does sound a little idiotic, but it is definitely one sure way of removing encrusting corals….
Use a 10 ml syringe filled with hot water and target the offensive area… slowly administer the liquid to the area… you be amazed of how fast the coral reacts to the liquid….. dead instantly…… IMO, very effectively…. Especially with encrusting SPS….
Pouring Boiling water in ???? think only idiots do that….!!!!