Obsessed with fish
Fish Herder
Ok, i will keep a close eye on him, thankyou!The reason... it could have been temperature shock. That's a cool tank for a gourami. It could have been disease, transport to the store, stress in the store, being bagged... fish are complex.
It's very (too) common for newly arrived fish to be ill.
Watch the survivor like a hawk. I have seen parasite infested fish jam themselves up against decor in an effort to scratch at the itch. If the fish moved sand to get wedged under the rock, that could be the case as gouramis are not diggers.