No one has ever grown one to 10", they're bought at that size. These fish rarely grow out an inch or two before mysteriously dieing for some unknown reason. Maybe you'll be the first, good luck. By the way Pirayas get just as big and I have one for sale and they grow alot faster than yours if you are interested let me know. I did the research on your fish and went this route instead and lost interest. Pirayas are the largest grown capitive P, and have been know to grow up to 16" plus. In the wild they have been seen at 24" plus. Largest manny usualy seen is around 10" and was imported that way. I had a 15" Black Rhom that was brought in the same way. Normaly this type of fish doesent grow to this size in the aquairum, it has to be bought this way.