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Looks like amblyglyphidodon aureus, otherwise known as the quite unimaginatively named Yellow Damselfish. They have them on liveaquaria.com if you want to look it up.
You have two different damsels in your photos, so I'm not sure which one you want identified. The greyish one with the white tail looks to be Chromis margaritifer (bicolor chromis). The yellow-topped one is a juvenile Neoglyphidodon melas (black damsel).