Don't Let ugly 'Red Slime Algae' destroy the beauty and delicate balance of your marine or reef aquarium. Now you can finally remove that unsightly red slime algae quickly from corals and invertebrates, without harm to fish, invertebrates, desirable macro algae, corals or reef inhabitants. Simply add Ultralife 'RSR' and watch the brilliant colors come back to your aquarium as the Red Slime disappears. Truly a product you should not be without.