im in the same boat had what i thought success with the first dose only to get it back again. This time its growing in my sand as if it was grass, and no amountsof tech m is helping, i ran 1800+ for a month without a dent. Also had a huge crash in snail etc, butno coral loss. I have returned al my levels to norma and will be removing all sand and any form of food it can possible feed on. My tank is diseased for life i think, i believe i need to get a clean up crew in there and let them feed on it with manual plucking and removing any source of detritus/nitrate etc. Otherwise tech m worked for abit , but i believe this stuff sticks around for a long time learking to sping back out...