Ok, the video is private, so cant see it.
You need to do alot of water changes to get the ammonia and nitrIte to 0, anything above is harmful and poisoning the fish. What test kit are you using?
You can do 50% water changes, every few hours, testing in between time, make sure you dechlorinate the water and temperature match it so as not to stress the fish anymore than they already are.
You will need to continue to do these water changes until the tank has finished cycling, stop adding anything except dechlorinator, non of it is useful.
If its a 29g tank, without knowing what other fish you have, I can say its overstocked and not big enough for a BP. What other fish do you have?