Superfish Airstone Model Superfish Airstone Model – SuperFish Air-Stones are available in different sizes, forms and shapes. Air stones degrade over time clogging up with dirt and grime so your air pump will struggle to function properly. It is advisable to replace air stones every year. Models available: Shell Star SuperFish surely makes your aquarium hobby successful, complete with aquariums, filters and filter media, heating, lighting, ventilation and useful accessories. It is our goal to make your aquarium hobby successful and also affordable. Click here to also browse a wider range of Pumps & Filtration products we stock!