I just set up my new 525 and I'm having a hard time figuring out the sump water levels. I have the most recent sump version as the system is new. Even though I'm not running a refugium, I put the removable refugium baffle / divider in to minimize the water noise trickling through the socks and cups. Then between the skimmer chamber and return chamber there is an adjustable baffle. The instructions say to have this only 1mm from the very top setting, which makes the water level in the skimmer chamber really high. But, if I lower the baffle all the way down, it doesn't change much in the skimmer section, and the refugium, skimmer section and return pump section are all about the same height no matter what I do with that baffle. Maybe I need to remove some water from the sump? I have the Red Sea 600 skimmer but have not installed yet. Even with the adjustable baffle all the way down, I don't see how I could ever use the skimmer without a stand to raise it, and I'm guessing Red Sea did not make a skimmer that wouldn't work in the sump they designed it for. I know I am doing something wrong but I don't know what it is. If you have this system and could chime in with how yours is set up, I would really appreciate. I'm running everything stock and did not make any plumbing modifications.