I did not mind the Koralia's, I just found their flow more direct. Now with the controllable Tunze's (6055), I find it is way better, plus with the controller you can really tweak it to how you like.
I would say two #4's would work great in a 90 if thats the route you are looking at.
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60 Gallon rimless, internal Herbie overflow, ATI Powermodule, Eheim 1250, 2X Tunze 6055, Tunze ATO, Euroreef RS100, Profilux controller, TLF Reactor.
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