Thanks much, Paul! I have no real regrets about the dimensions given that this was the max I could fit in the available space. Another 12" in length would be nice for aquascape to get more separation between rock mounds and maybe room for a small island. I like the 30" width and I needed that for the width of the sump and electric alcove.
I don't think a closed loop is necessary anymore with the internal pumps that are now available. I really like the Gyres (one at each end) and they provide plenty of flow in combination with the nozzles from the return pump. The "advanced controller" includes some nice random flow modes that adjust for night time. The cable for the one on the viewing end is not an issue for me. The "profile" of these pumps is fairly non-obtrusive both internally and externally. I used little adhesive-backed plastic clips and ran the cable down the black silicone corner joint so its not that noticeable. The Gyres do require regular cleaning to maintain strong flow.
My stand is 38" tall which provides a nice viewing height from a standing position and also vertical clearance inside for large skimmers, plumbing, etc. It seems like the "trend" is to go a little taller than traditional. Also, you need enough clearance to remove the skimmer from the sump. Mine barely clears for removal but it does have a larger-than-typical base being a recirculating type. I do need a small step stool to reach the bottom of the tank with my hand. Good luck and have fun with your project!
