I know it is normal for them to change colors, but my little "guy" (unsure of sex, but i call him a he lol) has turned brown. ive had him for about 4 months now. when i first got him he was always green, and then all of a sudden he turned brown about 2 weeks ago. i don't think much has changed in his care, he is still eating and has his water changed many times a day and is misted oftern, but he is still brown. Is this something to really worry about? Am I doing somehting wrong? Any advice?