Hey, i have a goldfish who is seeming to be getting slowed down in growth from our 30-35g tank. I just managed to convince my family to get a 75 g tank for our 1 goldfish (no other fish) but the question of is the size truly nessecary came up. I honestly cant figure this out. 1. How big a tank does my goldfish need in order to grow the biggest possible (not a fancy) 2. May i have links to articales that back this up? Please. If i can use it to persuade my family itd be great!