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Hey all, I have a pretty simple question but one I am kinda lost on because I have never used sponge filters.However after giving them some further thought, they seem to be the better choice in the tank im going for.

But here’s the thing: I have no idea how to measure the effectiveness of an air pump. HOB filters are simple; GPH and customizable media is all I really care for. However no air pump says the GPH or how good it is for filtering.

So does anyone have any recommendations for a light to medium flow air pump for the aquarium co op large sponge filter? My tank is going to be under-medium stocked so I don’t need anything too strong.

on a side note: how much does hob mechanical filtration really help with keeping the water clear? I do want clear water but I also heard that water changes are the main driver of that, not HOB’s mechanical filtration
 
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