So I bought this guy when he was 4 inches (hes now 6-7 inches) from petsmart. He was that light yellowish white but now that I have put him in my 120 gallon with Tahitian Moon sand substrate he got dark, real dark in about a matter of 2 weeks, now between his fins he is getting a bright green in the webbing so to speak of his fins check it out. Before and After Its on his tail the picture doesnt pick up all of it.
Before:

After:



Before:

After:



