I have had our Dwarf Gourami for 2 year now. We have never encountered any health problems with him. The last little while, though, he seems to be moping around a lot. He'll sit at the bottom of the tank on the substrate and brood. As soon as somebody gets close to the aquarium or at feeding time, he is his normal self and comes to see what's up. Is it possible that he is bored? Getting old? There are no signs of any disease.