Very pretty lion. I wouldn't worry about him not moving much as long as he's eating. Lions aren't the most active fish, although some will swim around a lot more than others (usually when hungry.) Try to wean him off ghost shrimp. Although they aren't harmful like freshwater feeders, he'll get a better died with prepared foods such as krill, squid, silversides, clams, etc. Using a feeding stick can help immensely.