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I was wondering what type of submersible filter i can put into the water without needing an air pump aswell??? i have a 29 gallon tropical tank
Yes. The air pump doesn't add oxygen - it stirs up the surface. The filter will disturb the surface as well (the one I linked to has different attachments which have different levels of agitation). (Even if your surface is not disturbed, you will still be getting oxygen exchange - having your surface disturbed just makes it quicker).
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