the Chemipure works, but only when you have the tank healthy enough for it to stay gone.
first, vacuum up as much of the slime as possible with a large water change (using good RO water/salt mix), run some fresh carbon, and make sure your O2 is good (flow/surface agitation). then start testing nitrates and phosphates daily. look for a PO4/NO3 ratio of ~ 1/30 give or take. and the nitrates should be low-ish - under 20ppm - so for example phosphates at .5ppm and nitrates at 15ppm. if you are far out of that range/ratio work that angle first. then, once that is stable and well, dose the Chemipure to kill off what slime remains.