Photo by Arpingstone [Public domain], via Wikimedia Commons
Although you wouldn't expect these colourful delights to bite, they do – simply to protect their territory, especially if there's a nest around. Don't venture too close to them, as unlike most fish, these ones are afraid of human company, and will not hestitate to attack. If you see them swim in a horizontal position, leave the area immediately, as this is their attack position and will gladly use their powerful teeth on you! However, do keep in mind, though these fish are instinctively defending their habitat, they're quite wonderful to observe as long as you don't disturb them.