[tang daddy]

The previous pics your corals looked bleached but still very healthy, I figure your tank is too clean. Are you dosing vodka or vinegar?

As others have said if you feed more then the corals will darken up abit accenting the colour. I use brightwells koralcolor but find it enhances only the blues and purples, not so much red and greens. As for amino acids it is used for feeding and polyp extension. Even if the brightwells products expire I would use it. Unless it was food I wouldn't be worried...

Btw your last pic of the green Millie looks good!