Yes, and tank layout certainly is a factor. The adults in my experience will aggressively defend "their" territory within the rock work without straying far outside that area. Even their own fry will eventually be seen as competition.
Yup I'll find out soon because one of my tank has that exact layout - one end with Julie Transcriptus and the other end Lamp Stappersi. Plants are blocking each other... This tank is going to be interesting soon when they become mature...
