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Fresh Fish Freak
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It's easier to minimize CO2 loss using a canister filter, that's why most people prefer them on planted tanks. It's also nice to be able to hide heaters and other in-line equipment, too. If not dosing CO2, though, HOBs are still excellent filters.

I'd go with a Rena XP3 or Eheim 2217 for your 37gal, personally. Or an AquaClear 110 if you want to go the HOB route.
 
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