Unless you add circulation pumps, I don't think you will have excessive flow. I am not an expert, but with a GPH rating of 394 without media, it doesn't seem excessive for a planted tank. I think tetras would probably be happy.
I love White Clouds. And they love current. I think everyone should give them a try. They are absolutely beautiful under good light with good food (bloodworms). I've had them for years. I think they are terribly overlooked. Very active, not shy. Peaceful when they have open swimming space and kept in schools. A group of 8+ is really something special and unique. When the males flare, they are gorgeous.