Can a goldfish be Very slowly Acllimated to a Tropical tank. My friend has a goldfish gettin to big for his 10 gallon. Hes had it 3 years since he won it a a winter carnival. Its about 8 inches and he wants to know if i will take it for my 55 if he can get it acclimated to tropical water. Is there any chance it could happen if you went really Slowly?