My now dead betta Poof was housed in a 2 gallon vase. For the first 3 weeks I had him, he was really great and super healthy. I did water changes once a week and he was always really happy afterwards. Around the 4th week I had him, he started acting really lethargic. His fins were clamped and he would just sit at the bottom of the vase. I moved him into a cooler, darker room and he just seemed to get worse, but still had an appetite. Then about 3 weeks after that, he stopped eating and two days later died. For 7 days, I added the melaleuca medicine into the water and then changed it at the end, but it didn't help.
My boyfriend also got a betta named Zorg, housed in a 3 gallon vase. The same exact thing happened to him. We thought maybe it was the water at first, but our friend had also used our tap water to fill her bettas vase and he is thriving.
Now I am worried it has to do with the water temperature. Our friend keeps her betta in an air conditioned room while our bettas are in a hot apartment with no a/c. I am babysitting our friends betta (Kenneth) now and got a new one (Nesdao) and felt their water last night and it was really warm. I am wondering if the warm water is what's killing them???? Perhaps the uneaten food grows bacteria quickly because the water is so warm and that is is whats killing them???
If anyone has any thoughts as to why they're dying please let me know!! I don't want my new betta to die and I don't want to kill my friends betta!