Well, thank you. i maybe i should let you know, that i know all of the above information, as i work in the uk's leading aquatic shop. i have listed this item before, and am getting fed up with re-writing the info. if people want to know thinks they can use the 'ask seller a question' function like you did. i know goldfish need space to grow,and realise this is only a starter tank, but i need to sell it somehow. i'll also tell you, that when my four foot tank cracked, this small tank housed 5 goldfish and a weather loach, and kept them healthy, for six weeks untill i could sell them. so thanks for your information, but next time dont bother. h