bleeding heart tetra, popular ornamental blackwater fish from rio negro, young male in bright colors show off in low light tannin

acidic adult amazonas animal aqua aquaculture aquadesign aquarium background biotope black blackwater bleeding bright brown characidae characin clear closeup colorful colors curious decorative ecology endangered endemic fauna fish fishkeeping freshwater habitat heart hobby hyphessobrycon instinct light low macro male nature negro ornamental peaceful piaba plant popular project protection red rio show smart socolofi spawning species stained tank tannin tetra threat underwater vegetation vulnerable water wild young