You can do a looped system. I have used it successfully on waterfalls where the feed comes from several different pumps (filter, circulation, 2nd filter). Use whatever size feed for the pumps, usually 3/4:, 1". For the loops use the largest tube you can get. At least 1 1/2. 3" if you can. (It is only a few feet). For the spray bar, use the desired size in the tank, but feed from a larger tube outside the tank. The dimensions are not listed, because you will do that on your own. Feed from one end if you wish, but from both for equal pressure across the spray bar.
Look at the 2 minute sketch. If it helps.