I have three goldfish in our little pond put there to take care of the mosquitoes. One is a little larger than the other two but all are little, maybe last year's feeder fish or the year before. This morning I go out there to feed them and they are crashing into each other in a lily pot and while I watch, the two littler ones are chasing the bigger one against the rocks....Aren't these guys a little young for that activity?