1) No idea. To me as long as the fish are not swept away by the current it is ok.
2) I don't use lily pipes. Don't think it would make much of a difference anyway maybe you can position the outlet directly at the side of your tank glass.
3) I am using 2213 for my 2ft together with a subfilter 250(2213 without motor) as a prefilter, and I can safely say it doesn't reduce the flow rate as much as you think. The difference is at most marginal.
The only time the prefilter reduced the flowrate was when it was clogged, but that would overwork the motors.
Your solution is actually either 1: use a different filter (maybe 2211) or 2: use the double tap or valve.











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