yep .look what they did to Honolulu beach ...killed everything from oils and tanning lotion .not even accounting the touching or accidental scrapes with coral and stuff.last time I was in the back the tank was only 4 or 5 feet high with the reef.what gives ..how do they avoid hitting stuff.In Florida they have you swim over the reef at disney and when I went down and waved hello at glass window with people and swam with fish ,they said ,"Ya can't do that Sir".......I always here that tune ! in this case I wouldn't want to endanger anything .I'm sure they've accounted for that.Theirs some "BRIGHT MINDS" at Atlantis with "LOT" of experience.Again ....how do they achieve this?