An algae bloom can turn the water green and is not always indicative of poor water quality. Metals in the water combined with excess light or the wrong spectrum of lighting for many hours per day, etc. are just a couple of the causes. Also keep in mind that many of the fish we currently house are found in waters that are naturally cloudy or stained.
Seller said it was a 120gal. tank. B.S! That ain't no 120!
and Im having a hard time believing thats a 17 year old fish or even a ten year old fish after all those years that thing should be at least 3' long I had one for 2 years and in those 2 years it grew from 4" to 18".