Man I really hate to recommend equipment to other people. The 75 had a small EuroReef skimmer on it. The model numbers have all since changed, but it was probably equivalent to the current
RS-100.
I still like the LifeReef Skimmer and I think Gecko will back me up on that. The quality of craftsmanship is second to none. I just should have gotten a bigger version for my 140. I think it would handle a 75 nicely.
There are really a number of good skimmers out there for that size tank. Just depends what fits in your budget.