The glass being referred to is the front glass of the tank. Some people don't like to see the starfish suspended on the glass, so I gave them the option of turning this feature off. There's no smooth way for the starfish to make the transition from the floor to the glass, so I only let it happen when the lights are completely off. Like all the creatures, the movement of the starfish is random, but if it is moving toward the front glass and happens to touch it when the automatic lights have the foreground totally dark, then it will switch to the glass. Same goes for switching back to the floor. So if the lights never go off, it will never switch.
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