I have found a pretty good way to catch impossible-to-catch fish in a
planted tank. place your largest fish net in the tank and leave it
there. As the fish become accustomed to it, they will use it as a
perch. If that doesn't do it, put the particular fishes' favorite food
in the net and wait and watch. Eventually, the "victim" will enter the
net and you can pull the net and fish from the tank. It takes time, but
it beats swiping the net through the plants. Hope this helps.
Justin in sunny dry Savannah