Quarantining an existing reef
I actually just went through this process in my 220 and finally got the last two fish out this afternoon. What worked for most of my fish was to wait until night... keep the room lights off and wait an hour or two after the tank lights go off so it's totally black and the fish are asleep, then turn the tank lights on full blast. The fish will still be groggy from sleep and blinded by the lights so they won't see the net coming.
After spending more than two hours with a net and a trap and catching nothing at all I tried this and was able to get 8 of my fish within about 10 or 15 minutes.
The only ones it didn't work for were my wrasse, who sleeps under the sand and didn't come out when the lights were on, and my blue hippo tang and firefish who sleep wedged in little crevices in the rocks and didn't come out when the lights were on either.
I actually just went through this process in my 220 and finally got the last two fish out this afternoon. What worked for most of my fish was to wait until night... keep the room lights off and wait an hour or two after the tank lights go off so it's totally black and the fish are asleep, then turn the tank lights on full blast. The fish will still be groggy from sleep and blinded by the lights so they won't see the net coming.
After spending more than two hours with a net and a trap and catching nothing at all I tried this and was able to get 8 of my fish within about 10 or 15 minutes.
The only ones it didn't work for were my wrasse, who sleeps under the sand and didn't come out when the lights were on, and my blue hippo tang and firefish who sleep wedged in little crevices in the rocks and didn't come out when the lights were on either.