Micro bubbles

[Proteus]

Water changes. You need to get the herbtana out of system. It could take three plus wc. As for the sand. Conchs, snails and sand sifter stars are your best bet

[Wayne]

Yeah that type of medicine makes bubbles like crazy if there is something aerating the water ie. Skimmer. With water changes and your skimmer it will eventually get cleaned out

[Coralgurl]

Thanks, will do weekly changes until the bubbles clear up. Going to try adjusting the power heads around a bit too to get more flow over sand.
Cheers!