That is the fish's normal behavior in nature. They tend to inhabit vertical walls and overhangs in their natural environment. I tried to recreate a similar environment but he has chosen a hole in a piece of LR instead. Go figure!
Bean
Todd,
My royal gramma spends the majority of its' time upside down or on its side. I worried for about a month thinking it was on the way to a slow misserable death, but instead it has be hanging out in its cave and growing like mad.
JD