I just had luck using a big net I left it in tank and fed fish with me standing there with hand on net did this without trying to catch fish so they get comfortable then when the fish u want is right there go for it
For a 40b, I would just drain the whole tank and take out the fish. For a few minute with out water, your tank will be just fine. I wish I can drain my 180 and take out the devil
nice lol. the time i did it i did a poland spring gallon bottle and like cut top off, slid it in upside down, then put mysis in there and put it in and the fourline wrasse went in. He was beautiful but a bully.