What kind of filter do you have? If you have a HOB (hang on back) filter, you may be aerating the water enough and won't need an airpump. If you want the extra aeration, you can buy a gang valve that you hook the airline to and can adjust the flow. They are really cheap (~$2) and you can get them at most pet stores.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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