I’ve experienced similar situations with a couple bettas. You can keep him on pellets if that’s what he will eat, but I would also try something different in the future like freeze-dried daphnia or as you said a different brand and see what happens.

Okay, that’s better than before but still not ideal. Also, I would not use the heater in that small of a tank as it will likely create too strong of currents and stress the betta out – keep an eye out for that. Otherwise, yes that sounds like normal behavior.

I upgraded him to Aqua Culture Aquarium Starter Kit with LED Lighting, Round Aquarium, 1.5-Gallon and it has a heater and hammock and the filter and so far he’s good he’s swims when the lights off and lays on his hammock most of the day or on the pebbles is he ok?

That tank is not permanent housing but a show-tank. You’ll need to purchase a larger 2.5-gallon (minimum) tank as a permanent habitat that can support a heater and greater volume of water where ammonia won’t build up as fast from waste.

It sounds like he may have vision problems in one eye causing him to potentially misjudge where they are, especially if he’s biting at them and missing. He should find them eventually though. I would recommend getting a regular fish tank with a lid though, as bettas jumping out of their habitat is a common way bettas die.

Sorry to hear about your betta. Have you tried soaking the binded medicated food in garlic juice? This may help disguise the medication better and be just enough to entice the better to gobble it up and improve the odds of curing the infection.