For a beginner tank I would say not to go any smaller than a 40 gallon. When your starting its much easier to have the extra stability that comes with the extra water volume. Clownfish need at least a 30 gallon, so 3 in a 10 is a def no no.
I could go through a lot more, but at the moment I am a little tied up. If I am able to later I will, but then I'm sure the other SW guys here will be able ta help u out before that.
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