I added two draws African frogs with the red beta in the 1.5 and they get along great. I added a female blue with the male blue in the 5G tank and they got teritorial again with the male chasing the female off. Ill probably remove the female blue and only have the one blue with the white female beta, they get along great by themselves. It kinda stinks I picked such picky fish to start with!
You need to add it every time you do a water change which right now should be daily until al your water parameters are good. Also I think you should stop adding more livestock. A 1.5 gallon is way too small for a betta and 2 frogs
Most people on here will say for your current stock you need a 10 and 20 gallon tank