starting a nano and need guidance

[rawest]

yea i think i'll turn my ten into a sump/refuge. i took out the tape measure and i think i can lose 6" three on either side for filter and return. i'll run the filter and bubble traps down the 3 x 9.5. leaving 14 x 9.5 inches for a fuge. from there i'll have a 20 or 23 long main tank. if i have to i can throw on a over hang aqua clear as a second refuge for pod prduction fill it full of sand and crumbles of live rock if needed. i just need to figure out the piping. i know a few ball valves will be a must but pipe size and return pump power. do they make return pumps with adjustable flow? or do i just wire one in on the circuit.