OK am.going to be controversial...again here.
Sorry but this is not " normal behaviour" I have never had clowns exhibit these kinds of "abnormal behaviour" but then I never keep clowns without their appropriate anemone.
I belive clowns without their anemone experience some sort of psychological disturbance and even stress without a nem.
You will never find clowns in the wild without their host nem, nor will you find clowns behaving in anything like this in the wild.
I mean, after watching this video below, how could you keep clowns without a host anemone. Clowns are happiest, content and IME exhibit none of the unusual, unnatural behaviour we often see or hear about when they have a suitable nem to frolic in.
I don't consider what OP is decribing as normal happy clown behavior either, but I have a pair of ocellaris clowns that swim around the tank just like every other fish in the tank. They do sleep in one corner as opposed to in the rocks like the rest of the fish, but as soon as lights go on, they're swimming with the rest of the fish normally. They are tank raised, so that may be why. Every other tank raised clowns that I've owned in the last 20 years wanted nothing to do with anemones and they were perfectly happy and healthy. That's just my experience, yours may be different, but to say they absolutely need anemones is false according to my experiences.
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