What's going on with my leather?

[Undertaker]

My leather is about three weeks old and isn't looking to good. Can someone please tell me what could be going on with it? I have a 55g My parameters are as followed

Ph 8.2
Ammonia 0
Nitrite 0
Nitrate.5
Phosphate 0.03
Cal 450
Alk 8.1
Mag 1400
I'm running t5's 2 ati blue pulse 1 10k white and 1 atinic. 2 hydor 850, reef octopus 110 skinner on a reef octopus 20g sump with BRS gfo and carbon reactor.

 

[sk8ter20art]

leathers can be finicky. The polyps will close for several days, then the surface gets really shiny, then that shiny layer will peel off like dead skin. its a similar action to molting as it grows larger.