I bought a dwarf gourami a couple of months ago and all was well until a couple of weeks ago. I noticed there was a lump on it's side, and it wasn't active at all. Also its blue coloring seemed to disappear. This morning it was lying on the bottom, on its side dead. I have 8 gold barbs and 8 glowlight tetras in my 29 gallon tank, with no problems at all with the others, color included. I tested the water, and it came back 0 ammonia, 0 nitrite, and 5 ppm nitrate. I perform 50% water changes weekly, and never miss a change. I keep a close eye on the fish, and none of the other fish bothered the gourami at all, in fact they all seem to school together as one big school, with no nipping or chasing. My question is did the lump have anything to do with his death? Is it a common problem? I also noticed the was bent with his tail towards the side where the lump was, and the lump and bent tail had been that way for a couple of weeks before he died. Thanks for any help in advance.