I'll update mine pretty soon. Also growing quick like yours but diet is mainly tilapia with pellets stuffed in it and occasionally some shrimp. Yours looks good
Got three vitts and and 1 g in a 400 us gal, the biggest v is just under 10 " very chunky went in late August at around 4 inches feed a mixture of live feeders and chopped fish. The second vit is very close but does not have the bulk/mass of the largest and the third is probably 1.5 " smaller still. The g is the same length as the smallest vit but not as chunky. Lots of colour on the vitts and the deep v in the tail is dispersing on the largest as the tail is broadening while the second still shows a deep v with extensions top and bottom.
I got in today, it's about 6 inch with tail, 5 body.
I've kept them before.
I was told it was on a shrimp and pellet diet, i plan to keep it the same, with maybe monthly feeder, likely molly young which are breeding in my sump.