Fish tank air pumps help to increase the amount of Co2 in the water, helping to keep the fish and plants inside healthy while maintaining water quality. They can also be used to power some aquarium ornaments, so provide a dual purpose.
There is no need to worry too much about noise, many air pumps have been designed with this in mind using noise-suppression technology to minimise the sound as much as possible.
You might also want to create a bubble effect in your aquarium using an air stone attached to an air pump. We have air pumps, air stones and a variety of accessories needed to utilise them effectively...
http://www.swelluk.com/aquarium/air-pumps-accessories-9/air-line-accessories-108/algarde-2-way-gang-valve-51.htmlAlgarde 2 Way Gang Valvehttp://www.swelluk.com/img/shop/thumb/algarde-2way-gang-valve-6mm2.jpg£1.89