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I have had Desi, my blue betta, for just over four months now. He recently has begun to lose a bit of the fin on his tail. At first, his tail just looked a little bit scraggly, and after performing more frequent water changes it seemed to stop.
Now I'm noticing that his tail is looking a good deal worse. I do not have pictures at the moment, but it looks as if the "webbing" or skin on the end of his tail, in between the raised areas, has fallen away. The remaining portion appears discolored, but no blood is visible. He appears just fine otherwise, appetite is great, and no changes in personality.

Does anyone have any idea what this could be, and how I can treat it?

What size is your tank? 2 gallons
What temperature is your tank? 78 degrees
Does your tank have a filter? No
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 small plants, dracaena.

What type of food do you feed your betta fish? Floating betta pellets and blood worms as a treat.
How often do you feed your betta fish? Once daily, except on weekends when he fasts for upwards of two days.


How often do you perform a water change? Twice weekly
What percentage of the water do you change when you perform a water change? 50%
What type of additives do you add to the water when you perform a water change? Water conditioner, stress coat, bacteria to help reduce ammonia/nitrite levels.

Water Parameters:
Have you tested your water? If so, what are the following parameters?

Nitrite: n/a
Nitrate: n/a
pH: n/a
Hardness: n/a
Alkalinity: n/a

Symptoms and Treatment
How has your betta fish's appearance changed? Area between raised part of back fins seems to be rotting or falling away. The remaining parts are discolored, and there is no change yet in unaffected areas of the fins.

How has your betta fish's behavior changed? Not at all. He's his usual adorable self.
When did you start noticing the symptoms? This morning.
Have you started treating your fish? If so, how? No treatment yet, waiting on advice and results from research.

Does your fish have any history of being ill? No.
How old is your fish (approximately)? I've had him for four months, age could be upwards of 8 months.
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