I've noticed that my male betta Iceberg has become very weak in regards to swimming. The only time that he actually swims around is when I get REALLY close to the tank, or when I feed him. Other than that he spends most of the time at the bottom of the tank lying on the gravel, moving only when he absolutely has too. I've also noticed that his breathing is quite heavy for a betta. I have noticed that his fins are becoming quite thin, compared to photos that I took of him when I first got him. I'm not sure if it's fin rot, because it doesn't have that jagged look that most bettas have when they do have fin rot. The fins are still smooth, just thinner and smaller. If anyone has any clue as to what's wrong, then your advice would be greatly appreciated!!! I don't wanna lose one of my babies :'( I hate seeing him struggle so much!!!