I recall seeing a large 300 plus gallon tank that Tom Barr was taking care of ,or setting up for a client.
Seems someone had placed unsuitable fishes in the tank and Tom was going to remove them.
The tank was a beautiful planted tank, and I asked how he was going to catch the fish in such a large planted tank.
He responded by saying, they would be shocked (electrical charge), which would momentarily send fish to the surface.
I have wondered about this for I too have some fishes I would like to remove without tearing hell out of my plant's while trying to catch them but I dared not ask out of fear,, that other's ,,possibly younger,, less careful,, would seek to try this and possibly sustain injury should Tom have chosen to respond. (Tom, you could PM me)
I have tried in the past to lower the water in the tank by 50 percent in an effort to catch the fish, but the tall plant's just lay down making capture of fishes even more difficult.
I too would be interested in a plan of action short of draining the tank.