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Sponge filter/air pump question


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I have a 21g long I'm using a medium size sponge filter on. The aquatop ap50 I use it with is too loud so I want to find another option. Will I get enough air using 1 nano air pump instead of the ap50 or should l use 2 nanos with 2 smaller sponges? It's a moderately planted tank, no CO2. No fish in it yet but planning for bioload to be relatively small (small school of neons, maybe a Betta and/or shrimp/snails).

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