It is pretty cool that they made a real reef and that they talked about what fish can take care of what pests, even if it was only was one sentence. Though it is pretty sad that they are still not teaching about the real process of establishing a reef, such as starting and filling reef tank in a short amount and pretending that angelfish are entirely reef-safe. Though I understand that they had to say that those two fish were reef-safe for two reasons....
1) Some people wouldn't understand how an animal can be almost reef-safe; imagine them having to explain how some angelfish don't exactly eat coral but they pick on and near it causing it to be stressed, this would be big shock since a lot of people think of corals as plants or more like rocks and then to tell them corals can get stressed!!
2) Some animal rights groups would not understand and use this as another example to shut down the reefing trade.