Hi
I don't have any water movement apart from Jabba who seems to just hop around in the water all day.
My plants aren't in the water though, I have pebbles in the entire bottom and I got a piece of acrylic plastic and used a hot air gun to bend it into shape put it in and filled that area with pebbles nearly to the top, then I cut a piece from the bag of soil laid that on top of the pebbles put some holes in it and then put a layer of organic soil over that and planted them in it, hopefully the roots will grow through the holes and grow into the pebbles.
Thanks