Growing aquatic plants doesn't require a fixed, immutable set of conditions, or else the plants all die over night. I am a good example of someone who can grow plants under far from ideal conditions. You can grow plants with just fish poop as fertilizer, with no filtration, with low light, with algae all over the place, etc. What we are trying to do is grow them well, healthy and vigorous. That is what requires the good conditions, including good water circulation. As I see it, the real dispute is over what constitutes good water circulation. That issue is still up in the air. But, the trend seems to be towards a lot more circulation than we used to see in planted tanks.Of course some flow is needed, I just don't think you need that much to have plants grow. And I'm sure there's quite a wide acceptable range in terms of plant growth, bio-filtration, etc., depending on one's setup. BTW how do the plants in a filterless nano setup grow. Is the flow that is created once a week during a WC enough? If flow is needed then that must be enough to provide them with nutrients. Or is it the small fish or shrimp swiming around enough to move nutrient rich water over the leaves. Either way the plants are surviving with almost no flow and certainly not flow on a regular basis.