You asked for color.
Mine inflate and deflate daily with little change of color. At night, or when I feed, they will extend the tentacles around their oral disks and appear more "open" then, but their color doesn't change much.
I do find their overall brightness changes over time with their being more pale when less happy, and super bright when they're loving life. That's why I suggested bringing your water chemistry in bounds and giving it a month.
Personally, I wouldn't dip it at this point.