I agree with Darin on the Remora specs. Once you get into the Aqua C EV series though, the sky is the limit. The EV 400 is rated for up to a 600 gal
tank although, again agreeing with Darin, I think most skimmers are overrated by the manuf.
As far as the Berlin Classic goes, it should have a Mag Drive pump...either a Mag 5 or 7. I believe the Turbo models are the ones that have pump problems. I have a Classic on a 180g using a Mag 7 and it has performed flawlessly for over a year. I never adjust it...all I ever do is clean it and empty the effluent container (1 gal
jug). True, it's not a great skimmer, but it is a good one. Be careful not to overtighten the fitting that screws into the venturi as the skimmer body will crack easily in this area. Although I know a 180 is a bit much for this skimmer, so far it's been doing an acceptable job. As soon as I can get the customer to spend the money though, I'll probably upgrade the tank to an Aqua C EV 240