Hi there,
Yes a Gourami uses those feelers to help sense out his environment and feel distance (like a cat uses his whiskers) they often come from Blackwater rivers which are stained brown from dead leaves and peat - the feelers help him see- they also use them to spare with each other (like a sword fight but no damage is done).
I had a gourami that lost one of its feelers (it only had one at the
LFS but i bought it anyway) and it took a very long time to grow back but it was never the same as the other one. Other nippy fish find their feelers very appetizing and will try to eat them.
Hope this is helpful
