I have a 10 gallon that I want to turn into a little display tank. I wanted to use either Neon or Cardinal Tetras. I was just wondering what kind of current should I have going. I have a marineland biowheel filter in it that is designed for up to 20 gallons. I'm not sure if this is creating too much current. I through some java ferns in there and they are moving around, but it doesn't seem like they are being heavily pulled at. I just don't want the fish to constantly be fighting a current if they prefer calm waters.