Who told you that bleach won't kill it? Unless they plated the treated water onto media and looked under a microscope for dinoflagellate then I think they're full of bologne or used the bleach incorrectly. Most disinfectants are just variants of bleach; outside the body, bleach can kill all sorts of parasites/bacteria and even viruses like HIV- you just have to know how to use it. Treat with at least 10% bleach solution over night and you've got a squeaky clean tank. My only worry is that you may not be able to rinse it all off and that will affect your next inhabitant. Anyway, that was my spiel. Personally, I would bleach everything with 20% solution, leave your tank and heater for overnight, maybe run your powerhead and filter. Then, whenever you have the time (the longer it sits in solution, the better) rinse really really really really really well with tap water (until you don't feel that slime layer) and then DI (or in this case, RO) water. This way, you won't have to spend money on anything not readily available. or use vinegar. whatever. i'm done talking. :p