I bought two koralias 1150 for my 65 gallon tank. I placed one on the left facing straight across the tank and the other in the back right facing the front glass andleaning down. I feel like it's too much power for the tank. It stirred up so many things on the rocks that made the water murky. And my two clownfish look like they are struggling to swim as they get pushed by the current. But everyone keeps telling me that that is the power I'm supposed to have. Prior to this I only had one 850 koralia running.