Ok, the internet is a great tool. It can help but it can hinder massively cant it? I have a 160L tank, well stocked and planted out nicely. I have a Fluval 3+ internal filter, that i have today, attached a spray bar to. Why i hear you ask? Why not. I thought i'd try it. I have positioned the spray bar above the water so that it drops into the water from a height of about 10mm. Am i wasting my time? Seems the internets disagree with them and all i need is just surface movement?