12-12-2013, 03:32 AM
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It's a bit of a personal preference, plus how much you're wanting to stock a tank. For tanks with heavier stocks (such as goldfish or African Cichlids), these tanks usually over filter for twice the water volume of more. For tanks with less fish, less filtering is needed.
I always overfilter just to be on the safe side, but always be careful that the flow from the filter isn't too strong for a smaller tank.
Rssky's suggestion of an AquaClear is great. They're very good power filters.
Canister filters are also an option, but not necessary for a tank that size. I think you would be fine with a filter rated for between 35 and 50 gallons.
Um, I don't think it makes a huge difference if it's one big filter or several smaller ones, but using just one filter is much more convenient when it comes time for maintenance.
You don't need an airpump, honestly. The filter takes care of moving the water on the surface to help with oxygen.
If you want one for looks/the bubbles, you can buy any size you like.