With Naturally Planted Bowls (NPT) they do fine as long as they are heavily planted. There are so many nutrients in the Miracle Gro soil that it fuels the plant growth like crazy for several months.
With shrimp, especially, there is no problem at all with not having filtration. With fish you have to be a little more careful to stock lightly.
The plants provide filtration so as long as the bioload of the fauna (shrimp, fish, etc.) does not exceed the ability of the flora (plants) to suck up the nutrients then you are just fine.