Male or female??

Good morning everyone. I was looking for the forum to post this is but could not find it..Question..I had 2 Oc. clowns. 1 was alittle bigger then then other. Well the bigger one dies from getting cut and infected and got worse..anyways. It died so the smaller one was left alone for less then a week. I got another clown same kind yesterday it seems be be slightly bigger then the one in the tank now. If the one that died was bigger, then givin what has been said the one that dies was the female? correct? leaving the smaller male alone for a week. Adding the new one which again is slightly bigger would it be safe to say the one i added is a female or another male. The one i got was alone, im assuming cause the others had been sold. So seeing that it is alittle bit bigger would it be the female and the one that was already in the tank the male..or 2 females or even 2 males. Would the one that stayed in the tank have changed sexes in less than a week or would it still be what im assuming the male? They were fighting yesterday nothing crazy just locked fins together and the new one chases the old one around keeping it in corners and just being a jerk. Is this normal would it pass or will the new one end up killing the old one?? Thanks for reading..any info would be greatly helpful.