text: aquarium pump regulate tiny and slow bubbles only? as you know all the air pumps used for aquariums generate big air bubbles and they are released inmediately...  so  how you modify a very small aquarium pump, so it can only release by the air line only  tiny and slow air bubbles in the water?  describe for me the type of pump used, please. how many voltage, etc it uses?  is there a link for this specific air pump? actually, any aquarium pump will work.  to make smaller bubbles, the air should pass through a diffusing element or stone.  this will have small pores and a relatively large surface are to release the air pressure slowly over a larger area.  this results in smaller bubbles. these are available for purchase at a store that sells the aquarium pumps.  you could also probably make one by plugging the end of the regular aquarium pump hose, and perforating it as much as you need with a needle.  some testing is required, but you should be able to find the right hole (needle) size, and the number of holes to meet your need.