So my little blue betta has been hanging out towards the bottom of his tank the last few days. I didn't think anything of it because he and my other betta (in another tank) do that from time to time. Last night I noticed when I went to feed him that he wasn't moving very well and had a hard time swimming. It looks as if he can't or won't spread his fins and just slowly sinks back down after trying to swim up.
I looked online last night at the diseases and didn't see anything that looked like what was going on with him.
The only change in his aquarium is that I recently started using c02 booster for the plants in his tank.
I have another betta in a separate tank and they have identical plant set ups and the other one is swimming around like he always does. So there must be something effecting just the sick one.
He's not looking too good, but I hope I can do something to save him.
What size is your tank? 5gal
What temperature is your tank? Near 80
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? Just some plants, moss ball, wisteria, amazon sword
What type of food do you feed your betta fish? small, normal pellets
How often do you feed your betta fish? daily
How often do you perform a water change? 2 weeks
What percentage of the water do you change when you perform a water change? 20%
What type of additives do you add to the water when you perform a water change? Tap water conditioner
Have you tested your water? If so, what are the following parameters? No
Symptoms and Treatment
How has your betta fish's appearance changed? Outside of his fins not expanding? No.
How has your betta fish's behavior changed? Yes, he's been more lethargic than normal.
When did you start noticing the symptoms? A few days ago.
Have you started treating your fish? If so, how? No.
Does your fish have any history of being ill? No.
How old is your fish (approximately)? I bought him at the pet store a year ago.