First lemme give you some background:
Marley is about 11-12 years old. I rescued him about 5 years ago from a family that had way too many animals. He came to me with a seriously injured -but healed- tail. The top 3 joints are fused, he cannot whip it at people. He can move it behind those joints. My guess now is maybe an injury combined with an inappropriate diet/lighting situation led to it. He is able to get around fine despite it so it hasnt been an issue, in fact i suspect it probably led to his temper, knowing that he was missing a crucial defense.
I immediatly put him under UVB, provided heat from below and a basking lamp. His diet has consisted of a lot of kale and yellow sqaush with carrots. I get him dandelion greens and swiss chard to supplement it. Also the occasional banana, and treats like watrermelon. His favorite is oddly enough carrots. I try not to feed him too many because I notice him pick them out and leave greens for later.
He has always been a healthy, green, downright friendly iguana. I give him free roam because he is so good. He moves all over the house chasing sunbeams and exploring. He is even trained to poop in the bathtub. He waits for me to put him in twice a day, or if Im not there he'll go on the tile next to the tub.
Recently he has turned a noticeable shade of orange mixed with his green. He has also gotten very aggressive. I had him to the vet a few months ago and was told that his kidneys were somewhat enlarged. Since then I've been trying to get as much fluid in him as possible. I've got a 15 gallon shallow tuperware style tub filled with about 4 inches of water for him right next to the basking station and where he eats. He never drinks from it, just occasionaly poops in it.
The way the vet was talking, his kidneys could go either way. I dont know if that can lead to his color change or not. Could the carrots cause it? I know all about males and their sexual agression, but I'm not quite sure thats what it is. He's always been a very laid back ig. So now having him charge me ( a male) when I walk in the door or near his basking station snapping and hissing, it just makes me think theres something more to it.
RECENT symptoms:
reduced appetite
refusal to drink water
turned from green to orange
has gottan quite agressive (I've been bit twice in five years with him, both in the past two weeks, today I needed stiches)
What he has:
heating pad 24X7
basking lamp (60 watt infared) 24X7
UVB lighting 10" above 15X7
ample food
ample water
ALso its fair to note he recently cut the last 4 inches of his tail off on something. I never figured out what, but dressed the wound and kept it clean. It was a deep cut, past the bit of cartiledge, so i basically had to wait for the extra peice to fall off which it did after a swim/bath a few weeks later. Since then it hasnt seemed to bother him.
Sorry for the long post, but I am trying to cover all my bases here. I'd appreciate any advice you could give me.

