I know it is normal for African clawed frogs to peel their skin, but this skin has been hanging off his/her back for a few days. Also, the colors on my frog have been changing dramatically from dark brown to green. Here's a video of the dead skin. It's short because I couldn't get a good video without him/her swimming away. I recently put my frogs into a new tank but he/her started changing color after about 2 weeks in the tank. Please help.

Also here is a photo before his/her skin color changed:

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