Ya, looks like a Seaclone skimmer.. pretty junk, very hard to keep adjusted and working correctly. That was my first skimmer as well on my predator tank. It is better than nothing... but not by much. Tank, stand, and light look fine for a predator tank. You don't want really bright "reef" light on most predator tanks.
Please reconsider the PBT. Extremely hard fish to get established. I would definately recommend doing as many google searches on that fish before you buy one. The aggressiveness of them would probably go great in a predator tank, but they have a lot of issues IMO. I think the Powder Brown is a much safer option than a powder blue, but I really wouldn't recommend either of those tangs. There are literally dozens if not hundreds of tangs to chose from so I would suggest you keep looking and keep asking questions about the ones you like. Not saying you can't have a Powder Blue... just saying really read up on them before you buy one.