Just wanted to see what everyone recommends for levels of operating a powerhead in marine tanks. I have a 1500 Powerhead and only a small 55Gallon tank. I have turned it down so it isnt too much for the fish or inverts. I have heard its best to have these things on a timer which i am going to do, so that it mimics more of the oceanic waves vs having constant water flow. How does everyone attack this ? Constant, timed, how long is it timed etc.?