Reason why I thought it may have been was the guy had treatment for it laying around when I picked up the tank. Whats amazing me is the amount of life in that tank. I have 3 different types of crab, tube worms, dusters, brittlestars, astrea, turbo and a snail I am still trying to ID. The various worms I am finding very cool. I have noticed one bristleworm however he looks to be one of the not quite so bad types. From everything I have read seems like these guys have been getting a bad rap.
I was up to 1ppm Ammonia but water changes have fixed that now I am just working on nitrates.