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I have a Fluval Roma 90 litre (20 gallon) tank, community fish with live plants. At the moment just using the provided U2 filter but having read up on external filters they seem to be the way to go. I’ve never had an external filter before and I want something fairly small to fit in the cabinet - for example the Eheim Ecco Pro 130 or 200.
Should I get an external filter for this size tank? If so which one would be best. Would it be enough to have an external filter running on its own or should I keep the U2 filter in the tank too?

Thanks in advance for any help.
 
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