Just get 2. IMO getting 2 the same size has the same percentage of pairing success as buying different sizes because none of the ones you get at the store are mature anyway.
always buy in pairs, if you buy an odd number the clowns will outcast one of them. eventually picking on him and not allowing him to eat. causing him to die. i made this mistake so i know. My clowns were tank raised. the 4 i have left are doing great.
