This crypt, https://www.aquaticplantcentral.com/...c=Cryptocoryne
, should work similar to a sword in a smaller aquarium. And, there are other lower growing crypts that would go well with it. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
is a very good little "powerhead" that would work well in that size tank, for just circulating the water, especially if you modify the outlet a little to spread out the flow a bit. I used it on a 65 gallon tank!