I know my crowntail beta is sick, but I don't know with what. I got him August of 2011, and we were fairly poor at the time so we "splurged" and got one of those little Marina cubes for him. He was happy for a couple weeks then started showing all the symptoms of velvet (clamed fins, lethargic, looked like he might scratching around, refused to eat, etc.). So I treated him for that, and that all disappeared, but there was one thing... his fins were rotting away at the time. They rotted away to a point and have not grown back or shrunk since. I kept his tank very clean, especially due to his struggle with velvet.
It seems like he struggles to swim. For a while, he would lay on his side, but now he just lies very still when he's not doing anything. When he sees me, he dances for food like he did when I first got him, then he eats, and shrinks back down.
He seems to have a lot of energy, he just can't swim.
I thought it must be the irregularity of having such a tiny living space since I know I've taken care of him, but he is still this way with his new space.
What size is your tank? 5 gal.
What temperature is your tank? About 75-80 (F) (I don't really have a thermometer, but I believe the heater said it automatically adjusts to, I BELIEVE, it was 80, but I remember thinking it was in the range that bettas are supposed to be in)
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? blood worms and micro pellets
How often do you feed your betta fish? 1 - 2 times a day
How often do you perform a water change? weekly
What percentage of the water do you change when you perform a water change? 30 - 50%
What type of additives do you add to the water when you perform a water change? sometimes salt and AquaSafe
Have you tested your water? When I brought a sample to a Petsmart employee after his corydora friend died, they said it all looked good, but I don't know the specifics.
Symptoms and Treatment
How has your betta fish's appearance changed? Fins shrunk and look shredded
How has your betta fish's behavior changed? Seems too weak to stay afloat with current fins
When did you start noticing the symptoms? over 1 yr ago
Have you started treating your fish? If so, how? Tried treating velvet, keeping water clean, fed pea just in case it was a bladder issue.
Does your fish have any history of being ill? Just the mentioned issues.
How old is your fish (approximately)? around a year?
He looks like this (I have been doing videos because I have a hard time getting anything for a picture)