air stone?

[Aquattro]

No, you don't need it, and the bubbles will give you killer salt build up!

[Cubeman]

Salt creep - Exactly - with an airstone you will have difficulty seeing through your top glass after a few weeks. The spray from the bubbles bursting will coat the underside of your glass with calcium buildup reducing your light and creating more work for you.

[Proteus]

More than enough bubbles w skimmer

[The Guy]

Thanks everyone for your quick responses, appreciated very much.