I've been told to take care of our betta fish by my mom and if he dies she won't be happy when she's back. Something is up with him and I don't know what it is. He's been sitting at the bottom of his tank for the past few days (very inactive) and only goes up for air. It looks like he's gulping/gasping for air too.
He lost his appetite. 2 days ago I did a 50% water change and I noticed that his color is orange-brownish/rust - I've never seen anything like it before! The fish is basically half orange, he was always bright blue just a week ago. It's freaking me out.
What could be wrong with him? Bacterial infection, fungus or something? Inflamed gills or velvet? Ammonia poisoning/gills burns?? I did use a flashlight and took some pictures you can see below. I added aquarium salt and some betta fix drops to see if it helps. He was as healthy as a horse about a week ago.
He's about 7 months old and the only problem he had once was a swim bladder disorder which I got him cured by feeding him peas. I don't know what my water parameters are. The food he usually gets are blood worms (twice a week), BettaMin and BettaBites (pellets) - twice a day. But I haven't fed him for the past few days due to him being sick - I think making him fast might help a little bit. Also, it's about a 2-gallon tank (My mother and dad bought it) with no filter or heater (no thanks goes to the PetStore guys who told my parents bettas don't need anything!!). So his tank is pretty much primitive. He's on his own in there.
And like I said, my mom got really used to him and he's pretty much the only thing that calms her down and makes her happy. I hate to lose Bubbles (<--that's his given name because he loved to nest bubbles in his tank) to some parasite/infection. She'll be upset but all I know is I did my best!