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A small sponge filter would be a great choice for a Betta and/or dwarf shrimp. And probably solve any issues with surface film buildup and everything that goes along with that.
One like this could easily be cut to size. You could even hide it under the substrate if you want to minimize the appearance in the tank: http://www.bigalspets.com/dual-action-foam-filter-clover-up-to-40-gal.html
One like this could easily be cut to size. You could even hide it under the substrate if you want to minimize the appearance in the tank: http://www.bigalspets.com/dual-action-foam-filter-clover-up-to-40-gal.html
