When talking about red terrors I would stick to the "mayan" or "festae". Get the term red terror our of your vocabulary. all it does is cause confusion. Mayans have all the rights to the term red terror so saying true and false red terroris also misleading. Festae usually have a y or 4 shaped line right after the gills but its not always visible. But sometimes on small occasions they don't meet. Also on the festae the spot on the tail is smaller and towards the upper part of the tail. On the mayan however their lines will never meet and the circle on the tail is bigger and center on the tail. No matter what size festae and mayans are, you will ALWAYS be able to tell the difference between the two.