6 Best Red Slime Algae Removers of 2019

Fish & Reef Safe Red Slime Eliminating Products

Our editors independently research, test, and recommend the best products; you can learn more about our review process here. We may receive commissions on purchases made from our chosen links.

Our Top Picks

Best Antibacterial: AquaVision Aquatics Cyano Solution at Amazon

"AquaVision Aquatics Cyano Solution is a antibacterial agent which treats unsightly cyano bacteria in marine and reef aquariums."

Best Phosphate-Free: Boyd Chemiclean Red Slime Remover at Amazon

"Removes disease causing red cyanobacteria (red slime) from live coral and removes red slime, black, blue-green and bubble producing algae."

Best Fast-Acting: UltraLife Red Slime Remover at Amazon

"UltraLife Red Slime Remover removes red slime without harsh algaecides or antibiotics."

Best Large Quantity: Blue Life Red Slime Control at Amazon

"Acts quickly, easy to measure and use powder and treats 400 gallons."

Best Anti-Stain: Easy-Life® Excital Cyano Stain Remover at Amazon

"Excital Cyano Stain Remover offers a safe and easy way to restore aquarium beauty."

Best For Slime: Ruby Reef Sliminator at Amazon

"Ruby Reef Sliminator water treatment eliminates unsightly slime caused by cyanobacteria."

  • 01 of 06

    Best Antibacterial: AquaVision Aquatics Cyano Solution

    AquaVision Aquatics Cyano Solution
    AquaVision Aquatics Cyano Solution. Photo by Price Grabber

    AquaVision Aquatics Cyano Solution is a antibacterial agent which treats unsightly cyano bacteria in marine and reef aquariums. Reef tank safe, it may be used in both marine and coral reef aquariums. Instructions read: Dissolve 1 scoop (included) with 1 cup of aquarium water for use with every 10 gallons. 2 grams treats 400 gallons.

  • 02 of 06

    Best Phosphate-Free: Boyd Chemiclean Red Slime Remover

    Boyd Chemiclean Red Slime Remover. Photo from PriceGrabber

    Manufacturer: Boyd Enterprises | Features: Removes disease causing red cyanobacteria (red slime) from live coral; Removes red slime, black, blue-green and bubble producing algae; Oxidizes trapped organic sludge and sediment; Clarifies aquarium water to crystal clear; Promotes ideal enzyme balance; Contains no phosphates, algaecides or erythromycin succinate; Safe for fish, corals and other invertebrates, desirable macro algaes, and nitrifying bacteria; Fast acting, easy to measure and use powder; Does not discolor aquarium water; 2 gram size treats up to 300 gallons - 6 gram size treats up to 900 gallons. | Note: Recommended to provide additional aeration in the aquarium during treatment.

  • 03 of 06

    Best Fast-Acting: UltraLife Red Slime Remover

    UltraLife Red Slime Remover. Photo from PriceGrabber

    UltraLife Red Slime Remover removes red slime without harsh algaecides or antibiotics. UltraLife Red Slime Stain Remover is a revolutionary product that contains natural cellular matter, select biological accelerators and special supplements proven effective in removing red slime from corals and invertebrates.

    Manufacturer: UltraLife Reef Products | Features: Safe for fish, corals, invertebrates and other reef inhabitants; Fast acting, easy to measure and use powder; One bottle treats 250-300 gallons | Note: Causes skimmer overflow for days after treatment, so keep an eye on the skimmer collection cup levels to prevent overflow.

  • 04 of 06

    Best Large Quantity: Blue Life Red Slime Control

    Blue Life Red Slime Control. Photo from PriceGrabber

    Manufacturer: Blue Vet RX | Features: Does not discolor the water; Will not harm any fish, corals or other reef invertebrates; Acts quickly; Easy to measure and use powder; Treats 400 gallons. | Note: If overdosed, this product could have some effect on pH and oxygen levels.

    Continue to 5 of 6 below.
  • 05 of 06

    Best Anti-Stain: Easy-Life® Excital Cyano Stain Remover

    Easy-Life® Excital Cyano Stain Remover
    Easy-Life® Excital Cyano Stain Remover. Amazon.com

     Remove stains caused by cyanobacteria without using algaecides or antibiotics! Excital Cyano Stain Remover offers a safe and easy way to restore aquarium beauty. Revolutionary blend of vitamins and synthetic concentrates stimulate the growth of beneficial micro-organisms in light-sensitive places in the aquarium. Healthy bacteria growth displaces cyanobacteria to clear stains from corals, live rock, substrate and other aquarium surfaces. You'll see visible results within 10 days!

    When dosing with your tank with Excital Cyano Stain Remover there is no need to turn off any of your aquarium equipment (protein skimmers, etc.) just remove any carbon in the system while using. No water changes are required afterwards because it's completely biodegradable. Safe to use with all marine fish, invertebrates and corals. Will not harm the beneficial nitrifying bacteria in your biofiltration system.

  • 06 of 06

    Best For Slime: Ruby Reef Sliminator

    Ruby Reef Sliminator
    Ruby Reef Sliminator. Amazon.com

    Reef-safe and erythromycin-free solution to restoring aquarium aesthetics. Ruby Reef Sliminator water treatment eliminates unsightly slime caused by cyanobacteria. It contains no erythromycin and will not affect aquarium biofiltration. Safe for all aquarium fish (including scaleless fish), plants, corals. and invertebrates.