What size is your tank? 6 gallons
What temperature is your tank? 78 degrees F
Does your tank have a filter? Yes
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? None
What type of food do you feed your betta fish? Hikari Betta Bio-Gold
How often do you feed your betta fish? Once a day, 4 pellets
How often do you perform a water change? One or twice a week
What percentage of the water do you change when you perform a water change? about 1/5 of the water.
What type of additives do you add to the water when you perform a water change? Just bought Seachem Prime per Myates' suggestion.
Have you tested your water? If so, what are the following parameters?
Nitrate: <10 ppm (although with seachem prime my test kit may not be accurate)
Symptoms and Treatment
How has your betta fish's appearance changed? He has turned a dull grey. I have had a long battle with fin rot with him, and it was better and growing back, until a multi-day fish feeder caused these symptoms. His tail fin is tattered again. With a flashlight, there is a red around his gills that was never there before.
How has your betta fish's behavior changed? He is laying on the bottom of the tank, only occasionally going up for air. He ate two pellets yesterday, but otherwise hasn't eaten for a week. He is breathing heavily.
When did you start noticing the symptoms? After I came back from thanksgiving weekend using a multi-day fish feeder.
Have you started treating your fish? If so, how? I bought Seachem Prime and a pH balancer. Have been replacing half of the water daily, to no change.
Does your fish have any history of being ill? Yes, fin rot which had been healing before this.
How old is your fish (approximately)? I have owned him for 3 years, but he was full sized when I got him so he could be up to 4.
You can see the rust color on his gills below. Apologies for the slightly blurred picture.