What size is your tank? 5 gallons.
What temperature is your tank? Nearly stable at 78 F
Does your tank have a filter? Yes, a sponge filter.
Does your tank have an air stone or other type of aeration? There is an air pump attached to the sponge filter.
Is your tank heated? Yes.
What tank mates does your betta fish live with? No tank mates.
What type of food do you feed your betta fish? New Life Spectrum Small Fish Formula.
How often do you feed your betta fish? I used to feed her twice a day, but now I feed her at least three times throughout the day, depending on how much she ate at each session.
How often do you perform a water change? Weekly.
What percentage of the water do you change when you perform a water change? A bit more than 25%
What type of additives do you add to the water when you perform a water change? Aqueon Water Conditioner, Atison's Betta Spa, and recently a bit of API StressCoat. Currently I am running a fungus treatment with API Pimafix (tomorrow will be the 7th and final day of treatment).
Have you tested your water? If so, what are the following parameters?
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 5 ppm
Symptoms and Treatment
How has your betta fish's appearance changed? She has always been distressingly thin but now she is skeletal and her tail fin is a little ragged. There is also some "fuzziness" on her tail which I believe to be fungus and has abated somewhat since I started treating with Pimafix.
How has your betta fish's behavior changed? She's very listless and lethargic. She just stays in one spot at the surface all day until she notices I'm there to feed her. Then she slowly comes over and eagerly takes in a pellet only to spit it out again. As the pellet falls, she attempts to dive after it but more often than not she gives up before reaching it.
When did you start noticing the symptoms? Nearly a month ago.
Have you started treating your fish? If so, how? After attempting to simply lower the temperature to no effect, I've been treating the fungus with Pimafix, but also doing very vigorous water changes and giving her different "snacks" -- mostly frozen blood worms. I tried dried daphnia and another kind of food (don't remember the name) but the pellets were too big for her.
Does your fish have any history of being ill? No.
How old is your fish (approximately)? She is nearly two years old.
She used to be a very active and lively fish. She loved darting everywhere! That's why I named her Dart. She never used to just float, like I've seen other bettas do. She would notice immediately when I approached her tank and would zoom up to greet me.
If there's anything else I can do for her, please let me know. Or if she's just getting old, or had too rough a start on life (she was a baby rescue from Petco), I'd like to know that too.