I think you're talking about the bookshelf aquariums?
I would place whatever filter in the middle... I like sponge filters the best.
Teh size is good for a betta, a large surface area is preferrable over depth.
Sounds like a pretty good setup. I prefer the shallower/longer tanks. All of my Bettas spend their time at the top or the bottom of their tanks, everything in the middle is just exercise LOL.
It sounds good I too like sponge filters, but anything rated for 4 gallons or more will works.
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