I did get a Tunze 9010 and so far so good. I haven't quite got it fully tweaked the way I'd like but what's a tank without something to fiddle with. It is supposed to work fine hanging in the tank (without a sump), but I'm not so sure I'd do that as it doesn't surface skim, which means it wouldn't get rid of the scum layer on the top of the tank. A remora with a skimmer box would work fine, IMO, and skim the surface (good), but you'll have to keep the water level in the tank fairly constant. In a 75 that would mean not missing a day of topping off the tank. The advantage of the Tunze 9010 is that you could use it with a bigger tank, can set it up to work in sump, and it is very quiet. If you want to get something now and then sell it and get something more suited to a sump later, you could go with a remora or remora pro. I swapped out my remora for my 9010 and still have it if you want to pick one up used.