Looking for HOB Skimmer

[04V10]

Hey everybody,

I've picked up a few more things for my 20 gallon and I'm starting put a bit more bioload on the tank. I'm also starting to see the scum at the surface of the water, so I figure I would get a jump start on this until I lose something.
Anywho, I'm looking for a HOB skimmer for my 20 gallon tall. I don't have a sump, just a HOB filter right now and I have been doing 20% water changes every week. Things look great, but I can tell there is a beam in the water due to my LED's, so there is still some gunk in the water that can be removed.

Any help would be appreciated. And it can be anywhere around Cold Lake, Edmonton, or Calgary area as I frequent these areas often.