No, it's not stressful. Use Lee's three way breeder. You can find it online or at Petco. It's very, very clear, so they can't see it as well as a net box. It floats in the tank like a little boat because it has floats on the sides and vents to let water flow through it.
When he comes to the top for feeding, just scoop him into it and feed him IN IT every time you do. Tango knows I'm doing it but he's so used to it that he doesn't fight much. Sometimes he swims over the side as I'm scooping and I have to try again. Since it's a big clear box (if you take out the center divider), it's not like being netted. Feed your other fish at the same time. I do this with mine every day and he's fine. I even have a picture. Please ignore his miserable face. He's really just fine. :P
In fact it's so clear that he sometimes can't swim out of it because he sees through it and no matter which way I turn it he tries to swim through the bottom. :D