Aqua One O2 Plus Oxygen Block 20G - High Efficiency Oxygen Supplement for Aquariums, Fish Tanks & Ponds | Promotes Healthy Fish & Plant Growth

Product Description

O2 plus blocks slowly dissolve to replenish the oxygen and stabilise the pH in your aquarium, maintaining a healthy environment for your fish.  

Key Features:

• Suitable for coldwater, tropical and pond fish
• Easily adds additional oxygen to the aquarium water
• One block does a large amount of 40 - 60 litres of water