I started a sorority of bettas recently and shortly after they started dieing off. I had been keeping them in other tanks and divided areas before combining the bettas in this larger 16 gallon tank.
I've seen many other threads related to this, but it always turns into a thread about convincing the guy to buy a heater and do water changes and I miss the whole point about the disease?
I do water changes, about 50% weekly. The tank is a couple of months old now. It's planted. I has a 100 watt heater. It's only stocked with 5 false julii corydoras, 1 dwarf orange crayfish (CPO), and has also had 1 juvenile betta in a breeder box. The remains of the sorority of bettas in the tank is 1 cambodian female and 1 veil tail female. They were a few of my most docile bettas and are getting along very well. I would hate to lose them, its not easy to find docile females for a sorority.
I lost 2 fish to the pump impeller. They found a way to the back of the nano tank and it was a freak accident from there. I've since fixed that by covering the intake vents with foam. Never thought they could fit in there. Shortly after that incident I lost another betta. She initially showed signs of being sluggish and just hovering at the top of the tank. She wasn't clamped and looked normal. I did notice a small change in her mouth coloration (lighter) but it was hardly enough to think it looked too different. She died the next day. I now have another betta Ive since moved to another tank who is not moving hardly at all and her mouth is all white.
Do I have a fungus problem in my 16g? I think its what all my clues are pointing too, but I'm still quite new with keeping fish.
There's no point in saving this betta. She's too far gone and if I go by symptoms I've seen in a couple of the other bettas she will be gone in a few hours. It happend so fast and its usually down hill by time I notice the symptoms.
The big thing here is do I need to treat my 16 gallon to prevent problems with the current fish there?