[ACBlinky]

Something else that can be bad (even deadly) for your reef:

Unsupervised guests or children. People love to drop pennies into aquaria, no idea why, which can nuke an entire reef overnight. Party animals have also been known to pour alcohol or even put pills or cigarettes into tanks, and some young children like to offer their soda, grilled cheese and crayons to the fish. Also watch your Mag-Float - guests are sometimes compelled to help out, and can unknowingly scratch the living daylights out of a tank.