Aquarium Water Treatments & Medications

Dechlorinators and treatments for healthy, clear aquarium water.

Buying guide

A treatment works best when the water is on your side, so test first — a good deal of sudden illness traces back to water quality, and a conditioner or a water change often sorts it before any medicine is needed. When you do dose, lift the activated carbon out of the filter for the length of the course, since carbon adsorbs medication just as readily as the tannins and odours it is sold to remove. Test kits, conditioners and treatments all sit together on this page.

  • Free UK delivery
  • 30-day easy returns
  • Feefo Platinum Trusted Service

    4 products

    Aquarium Rescue Dechlorinator - 100ml / 250ml / 500ml
    3 sizes
    Aquarium Rescue Dechlorinator - 100ml / 250ml / 500ml
    £6.99
    Pond Rescue Barley Straw Bale
    5 options
    Pond Rescue Barley Straw Bale
    from £12.99
    Aquarium Rescue Snail Control - 100ml Sold out
    Aquarium Rescue Snail Control - 100ml
    £10.99
    Aquarium Rescue Parasite & White Spot Control Sold out
    Aquarium Rescue Parasite & White Spot Control
    £6.99

    Not sure what you need?

    New tank?

    Dechlorinate tap water before it goes in

    Cloudy water?

    Treat the cause, not just the colour

    Fish looking off?

    Test the water before medicating

    Water changes

    Treat every top-up

    Treatments and Water Conditioners for Fish Tanks & Fish at AllPetSolutions

    Explore our range of aquarium water treatments and fish medicines, which includes Algae Control and cleaning solutions.

    Unsure which treatment is best for your fish tank? Send us an email and we'll be happy to help you find what you're looking for using our Contact Page

    Clean water starts with the right kit — see our aquarium filters, replacement filter foams and media and aquarium heaters.

    Browse our range of fish medicines, aquarium treatments and water conditioners for fish tanks online:

    Why do I need to treat my aquarium water?

    Aquarium water treatments are a vital part of keeping water quality optimal and perform a wide variety of tasks. These include: 

    • Cleaning harmful bacteria
    • Reducing chemical levels
    • Neutralising pH levels
    • Controlling algae
    • Removing dangerous nitrites

    AllPetSolutions stocks a comprehensive selection of the best aquarium water treatments on the market.

    We are delighted to partner with respected brands such as AllPondSolutions to deliver every treatment and medication you could need for your fish tank.

    What Fish Tank Water Treatments does my aquarium need?

    Some medications are suitable when you have a specific problem or need to eliminate a particular pest from interfering with your fish's comfort. Others are general healthy water treatments that prevent any harmful substance build-up.

    Tropical tanks often experience algae growth, and so Green Algae Control Treatment is an ideal solution.

    Aquarium Rescue Water Conditioner Dechlorinator is another useful weapon in your quest for fresh water. It treats tap water quickly and effectively, to transform ordinary water into safe, de-chlorinated water perfect for your fish.  

    Are there aquarium Water Treatments for all types of tanks?

    If you've just started your adventure as a fish keeper, or have welcomed some new fins to the family, you want to make sure they have the best possible environment to grow and to thrive.

    Active Start Water Treatment is a great choice and promotes the rapid growth of valuable microorganisms which supports the biological cycle within your aquarium.

    Using a Health Conditioner is also a good idea. It helps strengthen the immune system for both tropical and marine fish, avoiding the use of any harmful antibiotics and keeping your fish's lives stress-free.

    If you need help to understand the best aquarium water treatments to promote overall health in your tank system, or would like a recommendation about the ideal product to eliminate any irritations, get in touch with the AllPetSolutions team and we'll be happy to lend a hand!