We love our Beta it was a present for my son's first birthday...It looks happy (it's activity fluctuates).
We feed it freeze dried red grubs by 'nutrafin' - I feed it about every 3 days and only a small pinch (4-5 grubs).
Our house is warm 25C and the bowl is 6ft above the electric heater (warmth radiating upwards toward bowl)
The environment is a small but clean bowl with a wide top (approx. 1ltr capacity)
I change the water every 3 days or so (usually a third is replaced) unless it is 'dirty looking' then 'Fish' gets a full clean (I wipe and rinse inside of bowl and rinse away debris from under the tiny rocks).
I use tap water that has been left on the counter overnight or for a few days (sometimes Britta filtered).
Any suggestions...we love our fish and want him to be responsibly kept.