So I am making a new 135 gallon system which has its own thread on here and wondering how to tell what pump to use. What I am worried about is if I buy a strong pump like a Reeflo Dart or Barracuda it won't loose much flo over 10 or 15 feet of plumbing. Do they provide these numbers on their site which I cannot see or is there a quick calculation you can do for flow rate over so many feet through a specific diameter pipe. Thanks all, I will have more pictures up soon on the 135 gallon setup. You can see it here, https://www.reef2reef.com/threads/building-a-135-reef.372459/