Mmmmmm really I wish mine grew that slowly, in less than 10 months my 2 largest have gone from 4 inches to 15 inches, theres just about nothing they won't eat. Though they haven't tried to eat any of the tank mates yet. They've turned my nicely planted tank into a waste land, that I've given up on trying to setup nicely because they keep moving everything, even the 3.5ft piece of driftwood I used to use as a center piece. Though they seemed to have tapered off in the growing department, now they just putting on body mass, and going to war with each other.