I've been thinking of doing the same thing with my 150. I've always liked Congo tetras, maybe some hatchet fish. I don't know but thanks for starting this thread,
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I think Gourami would be pretty cool in a 36, I'd probably do 3 opaline or gold (1m, 2f) along with a shoal of 6 to 12 smaller non nipping tetra or barb of your choice.