Throw a blanket over the tank for a couple hours to completely black it out, then take it off and immediately net them while they’re still asleep. Or do it at night after leaving the room completely dark for an hour. They’re sitting ducks.
I would do that but sometimes they go behind plants and driftwood to sleep. I've been trying to catch them for 2 hours and they're too smart and know i'm trying to get them. I'm about to lose my mind.