I had a similar setup to this for a while. It was fine without a skimmer for the first few months, but after that it started to accumulate a nasty skin on the surface of the water. I looked into skimmers and was down to those same 3, then I decided to build my own. I had enough room behind the tank to hide a 3 foot tall DIY skimmer, you may not. The Big Al's here in Edmonton has these skimmers set up on a tank so that you can see them in operation, they may have a similar setup around you. It helped in planning my own, and may help in your decision.
Patrick
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