I'm about to put a 29gal under my 75gal (if I can fit it. I think I can) And I'm loooking for some cool stocking ideas. Single fish, multiples. Dosn't matter. Let me know what you guys think!
I did something similar under my 90G tank ... put a 20G, currently a planted tank stocked with a pair of young Keyhole cichlids ... I might move them out later and replace with Rams or Curviceps ... there are a lot of good options ...