Hello,
We have a 55g tank, and Our gouramis get along fine with the rest of the fish in the tank. We have 2 angels, 1 turquoise severn, 1 redtailed shark, 1 rainbow shark, 4 lemon tetras, and 1 golden Killie wonder, that were all added to the tank with a Very large and mature Pleco.
We had 2 flame gourami's, and 2 dwarf gourami's. but one flame was not doing well, and passed on to that big tank in the sky.

All other fish are fine, and seem happy.
I think that part of the reason that everyone gets along ok, is that they were introduced fairly young<small> and are growing together. I would be worried about adding any new fish that were smaller now. But then, the golden killie is the smallest, and no one bothers it, it just floats along near the top and does it's thing....
I did think about getting some of the larger gourami's, but was worried that they would not get along with the smaller dwarf's...
I have noticed that with our tank, the gouramis we have don't stay near the top at all. they go all over, and Luv ot hang out in the plants around the middle or bottom..... I don't think they would care about anything taking up the top... at least not till they try to build a bubble nest...
fairyrose