comments:
Good lights are cheap now, even if you buy new. Forget Radions. You can get the same performance (or better) at half the price (or better). And this $30 automatic feeder works great for pellets and/or flakes: https://www.amazon.com/dp/B0BRCWP16K
I originally had a dispenser that had a small opening you could calibrate to dispense a certain amount of food at a time, but it works best with pellets of a certain size and can clump and dump unexpectedly… I switched to a wheel type and was much happier, especially since I have nano fish with really small feedings. It worked much better as you can carefully control feedings, however it is limited to a finite number of days (like two weeks) https://a.co/d/0fB91E87
You can also get an autofeeder that dispenses set amounts of food in for a week if you want to maintain your schedule - like this one I prefer these over timed release ones which have much more variance.
1 week vacay up to 7 days = no feeding (healthy adult betta will be fine) Over 7 days vacay = https://www.amazon.com/Petbank-Automatic-Fish-Feeder-Aquarium-Moisture-Proof/dp/B0BRCWP16K/ - set up to feed exact portions once every other day or every 2 days.