What works for me is to wait until late at night, early morning lights off of course, then when i decide to get ready to go in the tank i turn the lights on, sometimes the fish float out from the rocks within a few minutes totally asleep and are very easy to net when their in the open.
Worked for me several times and most recently my very large very aggressive orange line chromis.
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ChRiS
Current Tank Info: 72g reef 29g long sump/fuge, Vertex In-100
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