Increase the effeciency of your skimmer with a new airstone. It is wooden and really should be replaced efery month if not sooner for best resulds in your 28 gallon nano cube HQI tank.

Wooden Airstone Measures Approx

• 3" by 1/2
• Required For proper diffusion of particulate matter in any saltwater aquarium with a protein skimmer.
• Made Specifically for 28 gallon HQI nano cube but will work in other units.
• Replace Every month for best results on your cube or tank
• NOTE MANY OTHER BRANDS WILL NOT FIT THIS SKIMMER