Air Pumps

[phoenix2081]

Hi. My dad has a 47cm deep fish tank and wants an air pump. I'm at a loss as I don't use them. Can anyone tell me what I'm looking for with an air pump and any recommendations?
 
Thanks

 

[DrRob]

Depends what he wants it to do really. If he's after a pretty bubble effect then go for something that has good reviews for being quiet, as they all tend to be noisy beasts. Ideally go for something that has enough power to push air down to that depth and along enough pipe work to be in a cupboard in a room that you don't mind having noise in.
 
If he's looking at driving a filter or similar with it then they generally come with recommended outputs.

 

[phoenix2081]

What would be classed as enough power for a depth of 47cm?