Gizmo stays a constant peppermint green whereas gadgets colour varies greatly from peppermint green to a dark olive green depending in where he is and the temperature in that part of the tank.
That's too funny because Glurmo stays a dark olive/purple/gray color all the time and Lrrr changes from bright green to olive depending on surroundings and temp/humidity. Glurmo is such a strange one lol.