Well right now I have a yellow tang, atlantic blue tang, 2 clownfish, 2 serpent stars, and some snails. I originally was just going to upgrade to a 120 but after having my blue tang I decided to go with a 6 ft tank instead. I have a aquaticlife 4 bulb t5 light right now and I really like it, but I know I can't use that on the 180 so I will go with the 12 bulb t5 aquaticlife. I have a octopus NW 100, I know that is small for a 180 so I was thinking about going with a NW 250 or extreme 200. Any thoughts? I rather have an internal return pump rather than a external. I also have frogspawn, xenia, green pylops. I am more into lps and soft corals I guess. Anything you can help me out on I would appreciate it. Thanks Tim