I wouldn;t mess with a Phosphate remover as a band-aid, more things could go wrong that right.

Water changes, and run all the carbon you can! Mechanical filtration (floss) probably won't help much. How big is the tank? I would get 2-3 25% water changes done over the next 24-48 hours if that's possible.

Are you running high Ca or Alk levels? Have you checked PH lately?