[Okayamapiper]

Red slime is cyanobacteria. Slime removers generally contain some type of antibiotic or silver ion. If you want to introduce antibiotics or silver into your system, the slime removers will do the job though there will be some collateral damage to your biological filtration. Another option would be using aluminum oxide (not good for leather corals) or granular iron oxide. RowaPhos is iron oxide and will absorb your phosphates to immeasurable levels thereby starving the cyanobacteria without any negative side effects.

Cheers,
James