So... just as a note. I am a firm believer in two filters. Have one go bad and lose fish... even 30 years ago... it leaves a mark.The Penguin is not as well made or as durable, but it is rated larger. The AQ is a better device, but it would be just enough filter. You would be doing 25-30% weekly water changes, I hope, and if you don't overstock, you can use either.
I'd put both on!