i started cycling my 20 gallon aquarium two days ago. the only filter on my tank is an aqueon power filter 20 (125 gph) with a sponge i added for better biofiltration. my question is should i also have a powerhead running?
You should be fine on filtration. Doubly so if you're planning on using live plants. The only time I'd consider adding to/upgrading what you have now is if you were planning on running really over stocked and with no live plants.
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