That is a trilineatus, or three line cory. Which is the same thing as a false julii, because they are commonly sold as julii's. Pictures for comparison-
Julii vs. three line (I personally prefer the three line, but julii are more rare, so therefore more sought out.)
they're called that because they have three lines running from the halfway on its body down to the base of the tail. One line is the skin color, the other line is black in the center, and the last line is skin color.
How you tell the difference between a "Trillneatus" & a "false julii is there Caudal fin (back fin) if you notice the "trillneatus has bigger, darker & some what more aligned black dots on there Caudal fin (back fin), if you look at the "False Julii" the black dots are smaller and not so aligned like the Trillneatus.You have a "Trillneatus".Fasle Julii Trillneatus