I installed the unit on my 350 gal...i do feel it is a little underpowered for this size and am going to get the extension unit that is supposed to be installed side by side; and plugged into the wave controller. The rocking in my tank is nice but not exactly side to side. It rocks concurrently side to side and front to back. This has a lot to do with my aquarium design, aquascape, and tank size. As far as the inhabitants, the lps have immediately responded by opening huge....like my torch and goniopora. The swaying seems to help stretch those polyps. The unit is bulky, and will be kinda an eyesore if reefers cant locate a location behind the rock work.