What's the best way to reduce the water current in my tank?

Hi, there really isn't a way of slowing your filter motor down, the NEW model does not have the adjustable flow feature the older one did, so the next best thing is to divert the return water flow. You can put something under the return water flow to displace the current, I would place it in such a way that the water would flow onto the back panel or across the surface, these would both cause a circular current within the tank keeping particle matter suspended longer and better chance of the filter removing it.