There used to be a regular bunch who believed that that was the way to feed bettas ... feed 6 days and a fast day on the 7th. I quit that and just feed them when they act hungry in the mornings and sometimes surprisingly, my bettas seem to act more interested in other things but not often. Sometimes they seem to need to have a night snack but I generally feed light at night if at all but sometimes they go to bed before I have them fed and I do not get a fish up to feed them. Now that Diablo is my only one and he is an older betta he generally goes to bed early so I miss about 4 nights out of 7 with him. He is a healthy betta with this schedule and as long as he is happy with it so am I. Like I said before, the important thing is not to overfeed them at any one time and not too many times in one day so one or two times a day with not too many days missed overall should work.
Rose