Originally Posted by callistra
I'm sorry :( It may not have been anything you did. It may have just needed a more aggressive treatment, and it's hard to know that without time.
If you want some advice for your future bettas or current, you could fill this out: http://www.bettafish.com/showthread.php?t=49233
and we could talk about different care opinions that maybe could keep your next boy healthy but I really wouldn't assume it was your fault.
it could be it was very odd, I did everything to the book, I had bettas with fin rot before and I treated it with the same method, first going for conservative then proceeding to more agressive treatments as needed :/ He was a beauty though...
What size is your tank?
5gallons - 20Liters
What temperature is your tank?
Does your tank have a filter?
Does your tank have an air stone or other type of aeration?
Is your tank heated?
Yes with an adjustable heater, 25 W
What tank mates does your betta fish live with?
What type of food do you feed your betta fish?
Occasional Frozen mysis shrimp, the occasional frozen blood worm, spectrum betta pellets.
How often do you feed your betta fish?
Once a day, with one day of fasting once a week.
How often do you perform a water change?
50% and 100% weekly
What percentage of the water do you change when you perform a water change?
50% mid week (wensdays)
What type of additives do you add to the water when you perform a water change?
Stress coat api, double dose for healing properties
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed?
Dead fin tissue, brown-grey in color
How has your betta fish's behavior changed?
Not any way observable
When did you start noticing the symptoms?
After Ich treatment a week ago
Have you started treating your fish? If so, how?
Aquarium salt premixed and added to the water and keeping a steady clean environment, daily water changes with redoses in AQ salt
Does your fish have any history of being ill?
How old is your fish (approximately)?
I do not know, perhaps around 7-8 months?