I gotta take new pics of my planted tank with polys. The make great residents in co2 injected tanks since no amount of co2 bothers them. Especially the upper jaw species, my del is a sold 8" and my retro is around 7" and neither of them upset my more delicate stem plants (I'm keeping stuff like tonia and erios and sygonanthus and small rotalas and ludwigia and all the fancy shamancy stuff).
Now if only my algae eaters would grow faster so that they could eat away my BBA issues, then the tank would be perfect lol. Probably the one downside to having bichirs in a planted tank, limits your algae eating options quiet a bit