My tank came the same way. I hard plumbed mine, I think it looks neater. I didn't add it to mine, but some systems have a section of flexi line in the return side to reduce vibration and noise.
My advice is to take your bulk head, your return pump's nozzle and your measurements to the hardware store. You will end up needing more parts than you think. Once you have the pipes roughed out, add in 2 unions and 2 valves (gate is better than ball), 1 each for return and drain side. These are important if you ever need to replace a pump or your entire sump, as well as equalizing flow on the return side.
As for the PVC
, if you have a PVC
cutter, they are so much more convenient than a saw. Also save the scrap PVC
, great for building racks to raise your skimmer, to make frag racks, to hold certain LPS
As a side note, something that I overlooked or didn't find, do not use acrylic baffles in a glass sump. I had no idea acrylic swelled in water.