Hello and welcome to FF! I prefer not to mix fish and frogs because of potential for problems and injuries. Bettas have different dispositions in community tanks, some are nice and some are not. With sharp teeth to fight other males; a Betta can do some damage on an ADF if it so desires.
An adult male Betta's stomach is around the size of it's eye so do not overfeed it, 3-4 Betta pellets a day is enough. For the frogs, initially feed all will eat in 5 minutes daily and then remove all uneaten food. Once you do that can figure out how much to feed in the future.
If you have no filter, recommend change 50% daily with same temperature dechlorinated tap water. Easiest thing to keep tank clean is a bare bottom that can be easily "vacuumed" with gravel cleaner during the water change. Can also get a small internal foam filter and power it with an air pump. Once the filter is seeded with beneficial bacteria (around 30 days) can then reduce water changes to 50% once a week. Here is a care sheet to help get you started right: http://www.frogforum.net/care-sheet-...warf-frog.html . Good luck!



. I want to get him 2 buddies (it's a 5 gallon tank) but I want to do it right 
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