[What type of tank are you planning, ie. sps, lps, soft, fish only??? I have 2-3/4" sea swirls pushed by a ampmaster 2100 along with 2-6000 tunze streams in my sps dominant tank (135gal 72" long). I am very satisfied with the amount and variety of flow. I was to start over I might have looked into the ocean motions.]
[If I were you I would contact mbarta on this board. He has 90 gallon RR with a SCWD. I really like the gentle swaying motion of his tank. I don't know all the details of how it is plumbed but I am sure he can give you some ideas.]