my tank has a lid. i offer a tiny flake for rewards. he is a little agressive but will do anything for food if he is in the front of the tankHi! Yes, I have trained several of my bettas to do tricks.
Hand signals are very effective. If you have an intelligent betta you can use hand signals and vocal commands and eventually remove the hand signals to make your betta respond to voice alone.
I have not trained mine to jump out of the water, I would be a bit scared that the betta would practice the trick without me and fall out of their tank. But many have performed the trick on natural talent of their own accord! LOL.
The other question is whether you are going to offer food rewards. I have never used food as a way to get my bettas to perform. They either do it for the love of learning and the love of me or they just dont. I used praise to reward my bettas and I ended up with attention junkies!
What is your betta like? Does his personality show that he would like to learn? Has he displayed intelligence? I know that is takes a special kind of betta to learn tricks.
If you have any questions feel free to private message me, I am always happy to help!