From my investigation/experience with Pearls, they max out around 24" same as Leo and others. My pair have been the most hearty rays I have had. my female is around 2 yrs. The male, is somewhere close to that. Female is 11" now male 10" and mature. Will they grow huge...time will tell, but I dont think so. Mine are not agressive maybe a bit skittish at times. For comparison, my femael Motoro is 2.5 yrs old and 15+". Definitely my favorite rays. There are different types light/dark base, crocodile, 5 star. Here in the US, it seems the light base are most common. The rest are rare. IMO they all turn out nice and the pattern seems to constantly change into adulthood.