My betta kept trying to eat one of my female amano's eyes (because they look like pellets and bettas have an uncanny ability to stalk prey) until she became blind, constantly swimming around in panicked circles whenever anything brushed one of her antennas. I put her in my 29 gal and she's doing fine with her shrimpmates, she's probably still blind but you can't really notice a difference with the antennules that sprout over time or whatever.
That said, Amanos are great - they actually eat fish flakes once they learn to sense it. My amanos always compete with the other community fish for food, swimming upside down to the top of the tank to grab a flake before settling to the bottom to use their tiny feelers to shift and scrape tiny bits of food into their mouth. They do eat plants though, so you'll need to up your feeding schedule accordingly, or have enough/fast growing plants to regrow the eaten ones.
Also, if you prefer handling fish by hand like I do, you'll definitely want a net for these guys because of their telson reflex. It's okay if you don't know what this means, because I think it's more fun for everyone to learn the hard way. And they actually swim a lot, like fish with legs! I should've gotten a malacostraca tank instead of a fish tank, as they're so much more entertaining, and a lot less demanding.