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That and the angle of the light doesn't look right in some (e.g the first one...the shadow overpowers the actual fish). The angle of light doesn't make it look natural to me.What he means by, "wrong angles" is that you are shooting down on some of your subjects. You should try to get eye level or below whenever you can.
If these are your first pics underwater you are a FAST learner! Keep at it !!