Didn’t read all the replies…but here’s a couple
Yes, your “Nemo” can live in that bowl with your betta. Just add a little salt and you’re good to go!
Aquarium forums aren’t good places for info. Those people just complain about how to use a search function and never give real advice
If it’s on YouTube, it must be true regardless of what thousands of others say in the comments
Oh you want a sea turtle? Perfect! You can’t order them but just go to the beach and find a baby. It’ll work great in your 20 gallon long tank