These are not air bubbles these appear as the wax sets. Some candles have them some don't however it does not affect the quality or burn of the candle.

We recommend you keep the wick at 5mm and trim it when required. When burning your candle make sure you let it burn for at least an hour or until you see a full wax pool round the candle. This will give the room a stronger fragrance and also help prevent tunneling of the candle.