Hi all I'm a beginner fish keeper and discovered my betta died overnight. He was in the tank with 4 mollies. I've got a filter setup with biohome and all the neccesary media. The tank has been set up about 3 and and half weeks. I do 40% ish water changes every 3 days as I know my cycle hasn't complete yet. The water is treated to remove chlorine and chloramine and such. I feed every other day with tropical fish flakes. I never saw any aggression between the betta and the mollies so I'm unsure if he's been bullied to death. The other mollies seem fine at the moment. They're swimming about happily. https://vimeo.com/172279317 I'm new to this.. any ideas? Here's some photos of Bill. Can you shed any light on the causes of his death?