The former owner used it for a turtle and never had it more than half full at any point.

I am so stoked!
I have been out of the hobby for 10 years and cannot wait to get back to it. I have experience with wild caught, F1 and tank-raised Africans (Mbuna and Haps, Tropheus and Frontosas).
Now the fun begins.... stand & canopy building, filtration design, possible DIY background and stock selection.
My wife loves the colors and constant activity that Mbuna bring so they will fill this tank. Decisions, decisions.

I am thinking 5 species in this footprint (depending, of course, on male-female ratios)?