I have two clown fish one lays on the bottom on his side at night he looks dead but if I shine a light or tap the glass he wakes up. But I was told it normal sometimes when the lights are on he will hide in the back where I can't see him he must be laying on the sand because if he was moving i would see him. A few times I frantically looked around the aquarium to make sure he didn't jump out. He should be fine especially if he was tank raised.
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