[Myka]

I'm a huge fan of blow torches. Good for all sorts of pest killing! Including algae, majanos, aiptasia! If a blow torch doesn't work, then you didn't do a good job of it. You gotta roast them little buggers. You will cause a certain amount of ammonia spike, but if you only do one rock at a time in a decent sized tank it should be able to handle it. Personally though, I usually just setup a little Rubbermaid with powerhead and heater and "cook" the blow torched rocks for a few weeks afterward.