Dlee13
Aquarium Advice Activist
I have a 20 gal long tank that isn't cycled yet and I need a new filter for it. I was wondering if the Fluval U2 or U3 would be better? My tank has a lid and I have a cat so using a HOB filter isn't an option.
I'm leaning towards the U3 but my tank is only about 41cm high so would it be too big for it?
I'm leaning towards the U3 but my tank is only about 41cm high so would it be too big for it?