I had a mag5 in a ten gal on my last setup as well , I think u should get a used tunze 9006 or something along those numbers , they are small German made and skim like all hell , check it out
I'm selling a reef octopus bh100f good for 90 gallons, I have it on my 46 and it did a great job. Pm me if interested
I would definitely check out the marketplace for a used skimmer if you can. You don't need anything crazy.
A Vertex IN-80 would do very well on your tank. I think they're $200.
have you had any experience with vertex skimmers?