well, after reading luke33's experience with the 160 cone on his 125g heavily stocked tank, I'm going to recant and say that yes, you CAN run it on your 120g w/ 3 fish (dont get me started on tangs in a 4" tank).
Just a thought here, Stormy, but I also ordered a new impeller assembly so that if I screwed up the mod or it didn't work well I could undo it. Impeller for my G4 was like $30 from Marine Depot.
Could look at eshopps skimmers if you dont want to spend the coin on swc. I dream of soon owning a swc
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