Orders dispatched in 1-2 business days

API PH Down For Freshwater Fish Aquarium 118ml

Further 25% Off - Use Codeword: FISH25 at checkout

API PH Down For Fish Aquarium Makes Freshwater Aquariums More Acidic By Lowering The pH
  • The pH Down adjuster is designed to lower the pH of freshwater aquarium water
  • It makes freshwater aquariums more acidic for fish and plants when pH levels rise too high
  • Different species of fish need different pH levels to be healthy, so it is important to test the water regularly to ensure pH levels are precise for the wellbeing of your fish
  • pH is the measure of acidic or alkaline conditions in water
  • A value of 7.0 corresponds to a neutral pH
  • A value above 7.0 is considered alkaline
  • A value below 7.0 is considered acidic
  • Fast-acting
  • Colourless
  • Easy to use
  • Phosphate-free and nitrate-free
  • Will not cloud aquarium water or encourage algae growth


  • You can use the pH adjuster once daily in your aquarium, but you should always test the pH between doses
  • The pH adjuster will not cause any harm to marine aquariums, but it is designed specifically for fine-tuning pH, and is not strong enough to have an effect on marine aquarium levels
  • Safe for live plants
  • Does not alter KH levels


  • Determine the pH of aquarium water with an API pH TEST KIT
  • To lower pH, add 1 ml for every 10 gallons (38L) of aquarium water
  • Take another pH reading before adding another dose of pH DOWN pH adjuster
  • Some fish may be sensitive to pH adjustments greater than 0.2 in a 24 hour period, so changes of this magnitude should be undertaken with extreme care

Dosing Calculator

  • Add 1 ml for each 10 gallons of aquarium water

Product Review

View All Reviews