With the leather, do you mean a change from when the polyps are out to when they are not out? If so, that is normal. It may look to puff up a bit during the time when the polyps are out, usually when the lights are on. Most corals don't puff up at night because there is no light, and the reason for puffing up is to expand surface area, which gives them more exposure to light. Hope that makes sense.
So if you are noticing the puffing up in response to light cycles, no worries.
Live in the Western MD/West Virginia/DC Metro Area?
Join our very active regional forum Here
Like the advice someone just gave you? Add to their reputation! Click on the balance icon underneath their username and let them know.