I have a powerfilter and the output of the filter causes a pretty deep stream of bubbles. I'm slightly concerned that the water current is a little too high since my dwarf gouramis will completely avoid that section of the tank. Is there a way to slow down the water current while keeping up the excellent aeration that the return water provides? I was thinking of maybe using some sort of net or slope to slow the water down a little but I'm worried that it'll decrease the amount of oxygen available to the fishies.