I agree with Frank Castle, looks more a girl, than guy from that photo. The dorsal appears very dark, the profile is more torpedo shaped than steep, and the unpaired fins all appear rounded, all female traits.
It could be the way the photo is lit, so not 100% sure though.
Most of the carpintus complex use primarily algae and detritus in nature as their main sources of food. I believe one of the reasons some aquarists have problems, is using a diet of too many meaty foods. So the gut doesn't get enough purging with fiber.
Exceptions might be the molluscan, or piscivorous H minckleyi, but for most of the carpintus complex I found a very low protein, high spirulina pellet effective, I would also add hair algae to the tank from my pond in summer and believe the components of algae to help color.
above male carpintus "location Chairel", below tamosopensus preparing a spawning site.