My betta, Adonis, hasn't been his usual self lately. He usually swims to the front of his tank when I come closer to say hi. He also usually eats a lot. However, as of late, he hasn't been swimming much, he does not swim to the front and say hi anymore, does not eat much (he even avoids it sometimes) and tends to stay at the bottom of the tank or between leaves, away from sight. Oh, and he looks like he's been struggling to swim a little bit. No signs of anything serious from what I can see but I'm really worried that he's acting like this.
What size is your tank? 3 gallons
What temperature is your tank? Usually 78-82 F
Does your tank have a filter? Yes
Does your tank have an air stone or other type of aeration? No.
Is your tank heated? Yes.
What tank mates does your betta fish live with? Two otos.
What type of food do you feed your betta fish? Pellets, bloodworms.
How often do you feed your betta fish? Once a day.
How often do you perform a water change? Once a week.
What percentage of the water do you change when you perform a water change? 50% when he's acting normal, 75% as of late.
What type of additives do you add to the water when you perform a water change? Water conditioner.
Have you tested your water? If so, what are the following parameters?
Ammonia: 0 ppm (about a month ago, it went up to 0.25 ppm but I'm assuming it's because I had just added the otos to the tank)
Nitrite: 0 ppm
Nitrate: 0 ppm
Hardness: I don't know
Alkalinity: I don't know
Symptoms and Treatment
How has your betta fish's appearance changed? He looks like he lost a bit of weight.
How has your betta fish's behavior changed? Been very lethargic, anti-social.
When did you start noticing the symptoms? A few days ago.
Have you started treating your fish? If so, how? Nothing beyond water changes.
Does your fish have any history of being ill? When I got him from my boyfriend's coworker, he had fin rot. He's also had a short bout of swim bladder disease but that went away after a few days.
How old is your fish (approximately)? I've had him for 7 months but I don't know how long he was with my boyfriend's coworker before I got him.