I have four of them in a 120 gallon pond. 1 is 1 feet long and other two are 8 inches. The smaller one is 6 inches. have them in there for 8 months. Thought they had little space, so i am giving them a 1000 gallon plus pond in one week. i wanted to ask whether they will grow or not in that 1000 gallon pond. right now they are fat. Please reply.