Saw this and thought I'd share. Not my favorite filter but some people love them. And if you were to modify it, it is a decent filter for that cheap money. $23 is hard to beat.
https://www.amazon.com/s/ref=nb_sb_...s&field-keywords=penguin+350&tag=wafishbox-20
https://www.amazon.com/s/ref=nb_sb_...s&field-keywords=penguin+350&tag=wafishbox-20