Update: Gnag's skin appears to have become a tad more green now that I have refreshed a portion of the water. Soon, I will buy a full ten liter jug of distilled water, and refresh more of it. I am using up what remains of two ten liters right now, roughly 5 liters of water. The tank itself takes about 23 liters of distilled water to fill up to the correct height for the water. Any comments, questions, opinions, suggestions will be appreciated. Yes, that was the trick. I am sorry for the inconvenience of troubling you with this matter. However, at least you now know who I am, and what type of frog I own.