easiest for a DIY skimmer I would think would be a beckett skimmer or a simple airstone skimmer.
Becketts inject water into a tower of bioballs and through that turbulent effect creates the bubbles for skimming.
a google search should come up with some plans. I found some a few years ago.
I've seen ppl with huge 6 foot tall airstone skimmers. they turn into room cornerpieces with LED's lol...
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