Aqua C Remora, its a hang on back model. Just Plug it in and let it skim. No adjustments necessary, which is why it was my 1st protein skimmer and I've never replaced it. It does its job great, just make sure you get the one with the maxijet 1200 pump. You will see that a lot of people back this skimmer up, especially because of its ease of use and reliability to do its job while keeping a very fair price-tag. I did a ton of research on which one to get when I started this hobby. I narrowed it to that one and have never looked back. hope this helps.
-Josh P
WOO HOO My 300th post!!! lol