Merry Christmas Eve! Curious is anyone is using a Reefmat 25o with good success in a Reefer 200? I am a couple of days shy of the 1 year mark in my Reefer 200. Everything seems to be thriving. Good coral growth, happy fish, no problems now and cruising along. My only concern is that my PO4 just seems to be climbing. I am not chasing numbers but don't want to head towards a problem. I have been trying to run the system simply without using any chemical media. My PO4 is now up to .24 after a water change yesterday. I don't have any algae problems. With the slowly climbing PO4 I was thinking of adding the Reefmat 250. My concern is the lousy Red Sea valve and the constant up and down water level with it. I have never been able to get it set just right after the first few months. I am constantly changing the valve setting. I know the filter socks being changed is a part of having to tweak it but does the Reefmat keep you constantly chasing the water level? What has been the experience for anyone who has used it? Thanks for the feedback.