Don't think I've ever seen one at 9 cm, usually chilling around the 5 cm mark. Great fish, easiest way to keep them is with them as the dominant fish in the tank. They don't handle other dominant fish well at all.
i have 2 in a 75 gallon and they are always coming down with ick. My water test perfect I do weekly 40% wc. No other fish in the tank has ever come down with ick. Will not be replacing them with more golden rams.