McD57, external overflows with about 4' to back wall. I can walk around tank, and the lights slide back so I can get into tank if needed. Although I have not been standing in the tank since I put the rock in. Some of the rocks weight about 75#. If it were me I'd go with 96 x 36 x 36 the extra height really helps with the look of the reef.
Roklem, now there are (3) 6201 on each side. Each has it's own holder I use the sure grip holders. But because the acrylic is 1" I also use a great white magnet cleaner with each. Large on outside small with mount on inside. Only problem is cost 155.00 for each set. If my math is correct that's 465.00 for the holders on them pumps...
This weekend I'll try to get some new topdown shots..
Happy Reefing