To me, there are 2 fine lines being crossed on this thread.
1) Many of these comments strike me as coming down on the wrong side of racist generalizations. Just my $0.02.
2) In terms of Dgee's comment, unless there are people here with 1 green chromis in a 10,000 gallon tank, none of us are coming close to replicating nature. All are tanks are overcrowded by factors of billions, I'd imagine. So yes, some people's tanks may be twice, or 5 times as crowded as others. But we're all facilitating the capture of wild animals to cram in a plastic box for our own enjoyment. Criticism of others for the same thing strikes me as very hypocritical.