It is very difficult to tell sexes of Pleco in my opinion. Sorry j can't help Maybe Plecomaker can help you?
If you look at your clown from above, if you can see the spikes on the side it's a male if no spikes it's a female
Looks male, but I'm not positive.
Females are rounder around the vent and don't have odontodes I believe.
again not positive.
Thanks everyone... I think I have come to the conclusion he might be a she as it's very smooth and have never noticed any spikes down its sides when I have had it out the tank. So I'm wavering more towards a girl
Could be, keep in mind that odontodes grow with age, so depending on he/shes age they might not be done developing.