No such thing, as I was recently reminded of. The AC20 rates from 5 to 20 gallons with the adjustable flow. I still am worried it's too much current on my 4.5 at the lowest setting.
If I were you'd, I'd try a twin Red Sea Nano setup: one with filter floss and a chemical purification agent, and the other with carbon for water polishing and ceramic balls for bacteria attraction.
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