I bought a new colony of 5 tiger,and 3 albino tiger oscars so i will have a great chance to have 1 pair and healthy generations. That's why i bought them small =) In 6 months they will be about my hand size. (Feeding them with anchovy,squid,aerthworm , some kind of Diy fish wood which have large amount of protein,some vegetables ofcourse once a month mince and live fish will be included in their diet when they grow a little bit more.) I am sure they will be about 20 25 cm. I am not sure but some experienced friends say with this diet they will be mature about 18 months. They'r my first oscars.