I'm new to the site. Or fairly new. I've done alot of reading and looking through different sponsors stores. However some of the lingo and abbreviations are a little confusing to a newbie. I have a 120G tank that I'd like to convert to salt water. It is fresh water now. The canister filter I have is the Ehiem 2217. It works awesome on the tank now. I think it could be used in conjunction with a skimmer that hangs on the back. But how well it work is my question. Could it somehow be used with an under cabinet skimmer. Any suggestions? Thanks.