I just bought my first alligator gar. He is about 5". I am a little worried I won't be able to keep him very long as I know how big they get. I have him in a 180 gallon tank. Can anyone tell me how fast they grow? Will I be able to keep him for a couple years or is he going to grow faster than that? How big is he likely to get in a 180 gallon tank? And finally, does anyone know why they are illegal in Washington State?