I HAVE A 15 GALLON HIGH 
WITH A HANG ON SKILTER 250 WITH SKIMMER BUILT IN.
FOR FLOW I USED PARTS FROM SEACLON100 
I CUT THE PART THAT GOES TO THE PUMP 12'' SO IT GOES ACROSS
THE WHOLE TANK AND PLUGED THE ONE SIDE I CUT THEN DRILLED 4 HOLES ACROSS THE BOTTOM IT IS REALLY A LOT OF  FLOW SO IS...