I've been noticing that the tip of reggies tail is very dark. its not tail rot because its not shriveled or all the way around. its only on the top the bottom is white/grey. when hes in a situation where hes darker his tail starts fading into the dark tip but when hes light its mostly just the end. im a little worried about it being a circulation thing but if that were the case i feel like it would be dark all around not just the top. he shed his tail like a little under a week ago and he had some shed stuck on the tip of his tail but im pretty sure its all gone. I also think it was dark before his shed. is this something i should worry about or is it just the way hes colored? i can attatch pics in a bit if needed.