I used to put large mysis shrimps in the net and hold it in the tank. Initially, fish will run away from it but little by little, hunger will get to them, and by 1 week, half of the fish are in the net eating. By the 2nd week, all fish should readily come in the net. This obviously takes lots of patience but it worked for me.
The better way is to just simply use a trap. After awhile, few fish will go in and then the rest will eventually follow.
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