I used a pair of chopsticks when my clownfish went into my overflow.
With a little soy sauce?
Fish it out, get a micro fishing hook. Many use this technique to get fish out of established tanks.
You can get barbless hook, or just grind down the barb on a regular one.
I was going to suggest the hook as well. Any tackle shop will have the small gold bait hooks, you may be able to buy them without the barb otherwise just take pliers and crimp it down. Get some string and a piece of mysis. It should cause minimum damage unless he fights real hard or gets stuck. This was going to be my next step if the net didn't work.