Would try and get a male/female Pearl gourami for two males, may not get along even in larger tank.(I had two males that would not share 80 gal peaceably)
Would note also that the rainbow's ,and barb's, will easily eat the food's offered long before the gourami get a chance at it.
Might take some creative feeding to ensure slower feeder's get their share.
Bottom feeder's can forage much easier so few problem's with feeding them in my view.
I'll be getting a pair of gouramis (male and female) because later I might get them set up to be a breeding pair.
With the food, yeh I can imagine that would be the case, however I think I could manage that by spot feeding with tongs.
Any other opinions on my latest selection?