I'm all for overfiltering an over stocked tank. With that said, if your not showing any ammonia or nitrite, is it truly necessary to add more filters? Seems like it could be just adding more work by adding another filter to clean.
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Agree....
If your water parameters are good, I suspect they are minus nitrates, I will ditch adding FX5....or lighten up the stock...
With your current setup, need a bigger and increase frequency of water change is the way to go.
Overfiltration --- yes it exist....you don't slap an FX5 into a 20 gallons
