When I bought my new 4 foot tank (55 gallons) I was given as part of the package a magic jet filter 1000. I have tried experimenting with the splash bar and without straight under the water but the flow is far too powerful. It is battering all my newly planted plants. The problem is I cant find any way of turning it down? Ive never used a filter like this before. Does anyone use one? Can it be turned down or is it the wrong size filter for my tank?