Finger Leather Dying??

[dkop0978]

I have had my neon green tipped finger leather for about 4 months now. This morning everything looked okay, but when I came home tonight I noticed that the bottom of the leather looks like it is being shredded. I also noticed some little and big black spots on the base. Some of these black spots looked like they were moving but I couldn't tell if it was just my eyes from looking so hard. I took the best pics I could for tonight since I cannot find my other camera but I hope someone can tell me what is causing this problem.

[bitis316]

Take a toothbrush and brush the afftected area clean...."gently removing the black.....Turn up you flow rate, and then do a 20% water change 2days later....