If mine grows to that size he will certainly get the 180G he would need at that time; I honestly do not expect him to ever outgrow a 120....but if it is meant to happen then I guess Ive got some rearranging to do. Ive kept many cichlids over the years and have owned some true giants....16" oscar, 14" Midas, etc These fish took many years to achieve their sizes and never started out in their final homes. I upgraded them when it was needed....and provided a good water quality and diet throughout their lives. I don't really expect my Jag to get more than 14" because tt is rare, not out of the realm of possibility of course but I figure he will fall somewhere in the average size range. Fish is an extremely picky eater which I also feel will limit his growth vs one which ate everything in sight. However for the moment he is quite content being a teenage fish in a big enough tank for now....I have massive filtration and do large WCs so his water is pristine.