First of all there is L81 and Baryancistrus Xanthellus different species as listed by the ICZN, both Xanthellus variants will attain the same size, having had ''L177" outgrow my "L18" rather quickly and exceeding the original PC length of a mere 18cm you will notice they have since rectified this by combining them as 35cm. There are more large species of Plec here than small, i would suggest research.