Tom,
Thanks again for helping with the plumbing-brainstorm. The plumbing is so clean & out-of-the-way this time, my sump will be much easier to access. Those steel L brackets really strengthened the stand, that's for sure.
Ruth,
The new tank will go where our old hutch used to be for hold fancy plates & glasses. Unfortunately, my parents want us to keep this "family heirloom" (go figure

) so that will have to go into the spare room "formerly known as Anthony's marine fishroom." So the big tank will be in the dining room area, on the other side of the kitchen wall. I'm debating whether to set up the 90g split cube tank/seahorse refugium again in the living room or just a 20" cube as the new seahorse refugium.
Anthony