You are going to love those Gyre's on your tank. I put one on my 150, It's running about 40% right now. When I set it above 50% I get a slight hum from it. I'm thinking once it breaks in it will be quiet. I plan on adding a second one later to the other side of the tank. Then I will remove the Hydor's . Like I said you should enjoy your Gyre's, they really move the water.