That would be typically, Cren. Venezula that is suppose to top 22 inches, maybe more, Cincta's are suppose to reach 16 to 18 inches, Strigata (Sp?) is suppose to reach around 18, and lents get like 16......other Luburis Pikes usually get from between 12 to 16 inches long, in your tank, a Ven would be awesome because we could find out how big these guys really get.
Oh I almost forgot, Marms are suppose to get pretty big too.