My dolloi is over agressive maybe to agressive..there is no way I can work inside of the tank without it trying to attack and it attacks hard and fast...sometimes it think it will brake the glass. sometimes when I fill the tank it wil snap at the waterhose wich is above the water so his head comes out of the water and than it bites.
if I'm correct it's max is 4ft. I have had it for aprox 3 or 4 years I got it at +/- 13 inch.