Best way to remove a fish?

Hi everyone,

I'm wondering if there is an easier or safer way to remove a fish besides draining the water or having superhuman speed. I have a friend who is interested in the hobby and has set up a twenty gallon tank. As I've been helping him out, I was going to give him a Royal Gramma and Pajama Cardinal as starter fish that he's always liked. But I don't want to harm them or any of my other fish during the process.

What would be the best way to go about removing these two from the tank?

 

One trick that has worked for me is to place the net in the tank for a few days. Anytime you feed the fish feed them in the net, once they become use to the net then you can just net it.

 

This works sometimes http://www.reefcleaners.org/how-to-trap-a-fish

I have also had to drain my tank to catch a smart angelfish. None of my livestock suffered any ill effects from draining the tank and it only took about 20 minutes on a 90g tank.