l gotta agree with you on that, there is only one problem. From what i've heard you can't proggram the flow so a g6 would be insane inside a 48g don't ya think?
It's not insane in my 46g. I would highly recommend the G6 over the G3, More flow, more media room, for maybe $50 more. It's almost a no brainer. Remember that as the plants grow in they're going to block and slow a lot of the flow anyways.
Also, the outflow is split into two nozzles. That already cuts down on any blow-the-plants-over jet stream factor.