Hello all A few days ago it was my fathers birthday and he absolutly loves saltwater aquariums and he has only ever had a 20 and 25g. So as a birthday present i has going to buy him this http://www.homesalive.ca/Fluval-Premium-Aquarium-Kit--45-Gallon-Bow_p_932.html and set it up in his fly tying room while he was at work. So the first question I had was how much salt will I need? The box says its 45g but when I enter the measurments in the calculator above it says its 49g, and Im not to sure which size to go by. The second thing I was wondering was about how much sand should I put in? I still have about 20lbs of crushed coral from his previous saltwater and I would like to use some of that aswell. So if anyone could help me with this I would appreciate it.