At one point I had to move a Red Terror out of my tank to the hospital tank. When I put the net in, he would absolutly freak and smash around the tank.
Do not be disgusted---
The only way I ended up being able to get him out was with a fishing hook.
As he was the most aggressive feeder, I put a sliver of beefheart on a barbless hook. Lower the hook, pulled out the RT and immediatly put a wet towel around him to control him.
It worked, he was unharmed, far better than him thrashing around the tank avoiding a net.
i would not advocate this in most cases, however in extreme it is something to consider.