Same answer I gave you previously AND depends upon species. Not all Grammo's species grow at the same rate, not even close when comparing some. To be more specific, depends on gender as well. Males grow faster than females, all things being equal.
Just to put my opinion, males and females can grow at different rates, not always will males grow faster, size wise. Yes, usually they will mature quicker but sometimes females can be larger due to genetics given that all other factors are equal. For instance, with my small "group" of P.pulcher I have 3 and the sexed female is growing much faster than the rest.