Clam with pinched mantle

[tix221]

thanks Myka!

It is pinched in some areas(mostly near the bottom) and I see some white spot on the mantle( not sure if it is bleached or something else) . I thought it was stress related as I didn't take enough time to acclimated it but it doesn't go away. Today, the mantle extension is better but the pinch is still there. I am hesitant to dip it as it may stress it more but I read that you should do it when the clam is not too weak otherwise, it won't survive. Do pinched mantle just go away by itself or I have to take some actions ?