1. I feed mine 2 pellets in the morning and through out the day a few snacks, so around 5 pellets each day.
2. Clean their tanks about once a week, unless it gets very dirty and depending on how many fish you have.
3. I'm not sure about the flaring thing, my betta doesnt flare up very often but his tank is closed.
4. I like to watch mine, but i honestly don think it makes that big of a difference, they wont become snuggly or anything so you dont have to spend hours at a time staring at your betta, but try to spend some time with it so its not neglected!