<a href=showthread.php?s=&postid=15655134#post15655134 target=_blank>Originally posted</a> by Reeferon
For my new aquarium I want to get fish that are in an abundance in the wild.
Think about the damage C02 is doing to the world and the PH of the oceans. The power for your reef produces C02 no matter the source. In addition, your aquarium produces C02 as a by product of life. You will probably have to shut it down once the EPA officially declares C02 a pollutant. And you may have to hold your breath as well. Don't worry about the fish, they won't make it much longer anyway. But on the other hand, they produce C02 and maybe should go anyway.
...even if all us people died off today, the species we've hunted/driven to extinction aren't ever coming back.
Bangaii cardinalfish certainly aren't that far from extinction, which can be virtually exclusively blamed on the aquarium trade.
But to directly answer the original poster's question, I would suggest that the collection of damselfish is probably among the least harmful to the reef as a whole.