I bought a male red VT about 2 weeks ago. The first week, he seemed to be doing fine, but the second weekend I left him in the dorms while I went home Saturday. I returned Sunday and did a 100% water change (I had done two 50% the week before I left) and I noticed that there was a black outline at the edge of his anal fin and his caudal fins were tattered (no black edges though). I started doing 100% water changes starting Monday but the edge of his anal fin is still black and I keep finding pieces of his tail while emptying the water.
What size is your tank? 1.5G
What temperature is your tank? around 74 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? No
What tank mates does your betta fish live with? No
What type of food do you feed your betta fish? Pellets/flakes
How often do you feed your betta fish? Once a day
How often do you perform a water change? 3 times a week
What percentage of the water do you change when you perform a water change? 50% twice, 100% once
What type of additives do you add to the water when you perform a water change? Tetra BettaSafe Water Conditioner
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? Black at anal fin edge, tattered caudal fin
How has your betta fish's behavior changed? No
When did you start noticing the symptoms? Sunday (1/29)
Have you started treating your fish? If so, how? 100% water change daily
Does your fish have any history of being ill? No
How old is your fish (approximately)? Not sure (I've had him for two weeks)
Some pictures (I apologize for the quality of my iPhone):
The space in the fin is from a water droplet.
Because this is my first betta, I'm having a difficult time deciding whether or not this is fin rot. Should I take the next step and try the aquarium salt treatment? Interestingly, when I came back to my room today I found a small bubble nest around one of the plants in his tank (adding to my confusion).
Any help would be much appreciated.