I have had 2 Blue Royal Betta for 3 years now. Sushi and Sashimi (male and female respectively). This morning Sashimi passed away from conditions I tried to use different methods to help her with. Sushi suffers from buoyancy problems, but this happened when we moved him to a new elevation.
Sashimi was a very very active blue female Betta. I went on a business trip last month for 3 weeks, leaving the Bettas in the care of my wife. When I returned home, the water was nasty and algae had built up. The bowls were 2.5 gallon. I immediately changed out their water and cleaned their bowls (I have done the same before and it always cheered them up). This is the first time that the bowls have hit this level of ill repair. When I had them back into their bowls, Sashimi was lethargic. She was slow to eat and was staying at mid-level of the bowl.
I kept an eye on her and tried several different methods to try to sure her of any possible illnesses. She slowly digressed to staying at the top of he bowl, and a long strand of white "stringy" material appeared from her bowels. It was 3" in length and she developed a white fuzzy spot between her gill and mouth. She lost the majority of her deep blue color and turned gray within 2 days. This development was 2 days ago, and last night she stayed vertical at the top of the water. This morning I found her in her favorite sleeping spot, but she had passed away. I have never seen anything like this, nor found anything to explain it.
Any clue of what this was and how to treat it? I will not replace her for some time, but when I do, I wish to know what I can do to save them.
Sushi does not suffer from the same issues and he is very active, even though he has SBD, which is not curable. He eats fine and still works on his bubble nest from the leaves of the plant. He can not stay at any level of the water, but sinks to the bottom. He swims and retrieves floating food. but when he stops, he sinks. He uses the leaves of the plants that float near the top to work on his nest and will swim down to bottom to sleep.
Both of these Bettas were the most active and interesting Bettas I have seen. Sashimi was very active and did interesting tricks (something I have never seen a Betta do).
I Know water temp is very important, but we did not use a heater pad, but they never showed signs of water temp problems, nor poisoning.