My gourami was okay when I first got him. I've only had him for a 3 weeks, I think. I realized he had that spot a couple days ago, but it was small and I went away for 2 or 3 days. My parents were feeding them and I just checked up on them the morning after I got back and realized it was three times the size it was before.
Can anyone tell me why he has that?
I also have a blue dwarf gourami in the same tank and about 7 neon tetras. I had a big rock in the middle of my tank, but took it out and all my decorations I have in the tank at the moment are flexible. I only have a small rock cave in there. I don't know if any of that information will help.