Marina Cool Air Stones

These are shaped novelty diffusers rather than plain grey blocks, meant for tanks where the aeration is part of the decor instead of something to be hidden.

Key features

• Moulded character shapes sit openly on the substrate, which suits children's tanks and themed setups.
• Works as an ordinary diffuser underneath the styling: fine bubbles, gentle circulation and movement at the surface.
• Push-fits onto standard airline tubing from any aquarium air pump.
• Shapes and sizes vary through the year, so the selector shows what we currently have.

Treat it as a consumable, the same as any other air stone. The pores fill with mineral scale and biofilm over months of use, the bubbles get coarser and fewer, and at that point it is time for a new one. Plainer stones, tubing, control valves and pumps are all grouped in Aeration.