Hey all, so I already have a FX6 on my 75 gallon and it is working great but later on I am upgrading to a 200 gallon tank but do not want a sump on it. Now, I know that the FX6 is rated for 400 gallon, and whether that is true or not I want to find out. Have any of you ever tried JUST a fx6 on a tank bigger than 200 gallons with success? Thanks!