Betta Eating Behavior

Recently I've noticed that Mr. Moto (my blue veil-tail Betta) hasn't been eating the way he use to. His Cubus tank is also getting dirtier than normal lately as the flake food is gradually building along the gravel. So, I moved Mr. Moto into a clean MiniBow 2.5gal tank to monitor the issue. I saw that he'll eat a flake and a few seconds later spit it out. Some of the food is apparently breaking down in his mouth and going out through his gills, thus causing a cloud of flake food particles to come out.

I did some research where a few others stated having the same issue and I'm not convinced that this is normal behavior. Mr. Moto also seems to rest more on the bottom of the tank which also isn't like him as he usually rests on top of his plants. He is still occasionally active throughout the day, no signs of illness or fungus and he still attempts to eat.

So here's what I did which seems to have stopped the issue...

Step 1: Do a complete tank cleaning.
Step 2: Do not feed the fish for an entire day (24hrs).
Step 3: The next day only feed the Betta 4 big flakes (about 1 cm diameter) throughout the entire day. You should not see any food coming out through his gills.
Step 4: Only feed the Betta once a day (try to do this the same time every day), a very small pinch of food from here on out.

Keep in mind that Betta's love to eat, but you should never overfeed it. Although your Betta may look hungry and keep eating, I wouldn't feed it more than this. Your Betta more than likely will not starve either. Also, I still have not figured out why Mr. Moto keeps resting on the bottom of the tank but I will continue to closely monitor him.