It looks good other than the split in its tail....I have three that I have had for awhile. They have all been growing quite rapidly since I got them. I feed them an assortment of frozen bloodworms, frozen brine shrimp, and cichlid pellets (alternate days, not everyday of all). Also, what size tank do you have them in? I see it is in with a larger parrot, is it getting its fair share of the food? There are a lot of factors that can affect thier growth not to mention they are a hybrid.
I agree with the previous post that it also can depend on the individual fish. Some can grow to monstrous size while others just remain average. It is a cute little fish, like the yellow coloring.