Betta just died. Any ideas why
Ok, so I just lost my betta and I'm not sure why.
He was in my fully cycled tank with a couple of mollies and 6 neon tetra. The water quality is always good in terms of ammonia(0) nitrite(0) and nitrate with the latter currently showing very low levels. The temp is fine. The ph is around 7.5 and hardness is high as I live in a hard water area. There is zero chlorine present.
All the other fish are health but for the last few days the betta has been very quiet. He was floating around, sometimes facing straight down or up and sometimes sitting on the bottom. My conclusion was swim bladder disease so I upped the water changes.
Earlier today he suddenly got very stressed and just died!
Any ideas what may have caused this?