Still working on this... Looking for storage containers to keep gravel vac tubes and long handle stuff in. Think I may have found the answer. I am looking at the under bed type totes. This would work great under the 65B and get that stuff out of the way.

Problem is the one I got at Lowe's going to be tight. I might need to look at other stores to find one about 2" shorter. I have the tote in my car so I have to wait till Im home to test it
Edit: under bed tote under rack worked but was tight and rubbing on rack so wife suggested to remove the clip handles on the sides and now fits perfect. I have storage for all the long cleaning items!
My hope is to get the other 75g going this weekend. I need to do the cut out for the Aquaclear filter and heater on the plastic backstrip but otherwise the background is installed and ready to go. I have all the shims figured out for the rack but I need to have it held in place while water weight is added to the tank. It has a tendency to want to pull forward so I will need help from a buddy to get it in place.
Thanks to
@sir_keith for the lighting recommendation. Have the Beamsworks EA fixtures for both 75's with timers and waiting for the one for the 30g to come in. This way all the top tanks will have macthing lighting color tones. The bottom 65B are Current USA Satellite Plus which I have no plans to change. Should not look too strange.
Edit: Light came in for the 30 gallon, was a little worried cause I bought it as a damaged box item to save a few dollars. Seems fine and works. I still need to figure out filtration on the 30. I have an Aquaclear 50 but would feel better running a 70 if Im moving the puffer over. I think I want to get a little larger heater for it too.