I've had my main display tank (Red Seas 65 gal AIO) for about 8 years. It's had a few ups and downs, but is just absolutely beautiful now. It is a mixed reef tank with thriving SPS up top and lots of LPS in the lower half. Also have a WB Cube 20 in my office that is fairly new at about 4 months running. This one is also a mixed reef. Everything is pretty happy and growing!
