Okay... I'd finalizing my specs. on my new tanks and need some input on drain and return size/holes. This is for a 270 gallon tank with an overflow of 16"x5.5". I wanted to fit one drain hole and two return holes but do not know what size hole to drill for the bulkheads. The drain would be in the center of the two smaller holes for the water return pipes. I'm planning on running a FX5 rather than using a wet dry for the plumbed underside and perhaps a second FX5 into the actual tank. I was thinking a 2" drain and two 1.5" returns thru the overflow chamber. Any input would be great.
