Colt coral help

I got a colt coral last Friday, it s not looked to great , just been kinda slumped over, not really shrinking but just kinda slumped over, there's one large one and 5 small ones on the rock with a lot of polyps. Two of the smaller colts have looked great , nice pinkish color, and the rest are more brownish and slumped over. ( the polyps look great.) but anyways I noticed when I got home from work today, the larger colt and the other 3 on the rock that have been slumped over since I got it had some whitish clear spider web stuff coming off them today, but they look a lot better today. Is it just maybe shedding and just now peeking back up. Other than the clear stringy stuff coming off of them they look a lot perkier and pinker today.
 
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