Nice!
My SD tank is only 6 ft. I too have a bunch of cories and a school of tetras and a small pleco, with 7 SDs (lost one some time back). But I am planning on adding ~3-5 fish. But mine will stay smaller than yours, as your red-hooks will eventually be huge.
My 7 fish are of 3 species, and I am heavy on males. I need to add certain species of fish, and of certain genders, not just any SD. I believe that more females is better for the 'troop' in the long run, and in daily behavior; this may be particularly important in relatively smaller tanks.
I am also putting together another tank (6'). Have not yet decided what to do with it.
Thanks.