I have used this on another Goby. (Cave Goby) Place two nets in the tank on either side of his favorite hangout. Fairly close to it. Then place a bit of his favorite food on the sand between them. When he goes for it, scoop with one and cover with the other net. Worked for me.
I feel your pain....lol The watchman that is in my tank is a sly fox,. Everytime I get near the tank to nab him he jets under the rocks and stays put. He's a cool fish, just way to manic about piling the sand.
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