I stopped documenting its growth for nearly a month, and lost track of the instars during that time. I eventually settled on rearing it on leaves of various apple cultivars from around my neighborhood. Most natural daylight in my room only enters through a skylight in my ceiling, so during the day it was often dim in my room. It showed an appreciation for basking in sunlight during the day, and would stretch out its body prominently on exposed leaves in the best orientation to catch the incoming rays. I don't know if this is a natural behavior or not.