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Hi jak61,
Welcome to TPT! I have a strong preference for the Hagen (Fluval) Aquaclear series of HOB filters; I use and own 5 of them. They are reliable, quiet, with excellent customer service and parts availability. The filter media stacks horizontally (which is great if you use the filter for DIY CO2) and output is adjustable. For a 20 gallon I use an Aquaclear 30 or 50 depending upon how heavily planted it is. In planted tanks I use two sponge filters and no charcoal/carbon.
Welcome to TPT! I have a strong preference for the Hagen (Fluval) Aquaclear series of HOB filters; I use and own 5 of them. They are reliable, quiet, with excellent customer service and parts availability. The filter media stacks horizontally (which is great if you use the filter for DIY CO2) and output is adjustable. For a 20 gallon I use an Aquaclear 30 or 50 depending upon how heavily planted it is. In planted tanks I use two sponge filters and no charcoal/carbon.