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IMO, combo skimmers aren't that great. I think you'd be much better off with a separate fuge and skimmer. With a 75g, you have plenty of room to hang equipment off the back of the tank.
A good skimmer can help remove organics before they breakdown into fuel for your nuisance algae, and a fuge with macro would compete for the same food your bad algae is getting. Cheato is often the macro of choice because of its fast growth (which means it's eating alot of the bad nutrients in the water) and doesn't have the issue of "going sexual." A fuge can be strictly for nutrient export, but it can also feed your tank. Fuges are also nice because they can be a predator-free environment for things like pods to reproduce and grow into food that the critters in your tank love to eat.
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