I was here not long ago because of Ichigo's fin rot but later discovered that it was in fact tail biting. Since then he has stopped and he is slowly regaining new growth, but I noticed something on his dorsal today.
Located on the very last ray of his dorsal fin, I found what appears to be a small patch of fungus. I added two amazon swords to his tank about 3 weeks ago, could they be the culprit? I added some slate to his tank two days ago, did that cause it? Should I worry about my other betta having the same problems? I was sure to file down any sharp edges before adding it.
If it is fungus, how do I go about treating him, what about his tank mates?
What size is your tank? 10 us gallons
What temperature is your tank? heater is set to 78
Does your tank have a filter? yes with carbon added
Does your tank have an air stone or other type of aeration? yes, an air stone
Is your tank heated? yes
What tank mates does your betta fish live with? two apple snails and two cory cats
What type of food do you feed your betta fish? Betta Min flakes, Tetra brand freeze dried blood worms
How often do you feed your betta fish? once a day
How often do you perform a water change? weekly with gravel vac
What percentage of the water do you change when you perform a water change? 10-15%
What type of additives do you add to the water when you perform a water change? dechlorinator drops
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? fuzzy white ball on his dorsal
How has your betta fish's behavior changed? No change, still very active and eating well
When did you start noticing the symptoms? Just now, I jumped on this site and took pictures as soon as I saw it on him
Have you started treating your fish? If so, how? Not yet
Does your fish have any history of being ill? Tail biting
How old is your fish (approximately)? 1 year