ritual fight for female and games of of bleeding heart tetra adult males, fantastic blackwater characin fish behaviour, rio negro

adult amazonas animal aqua aquarium aquascape aquatic barcelos basin behaviour biotope blackwater bleeding bright business captive care characidae characin clear conditions controlled cultivation cute decorative design dot driftwood dwarf eco ecology endemic fantastic fauna female fight fish fishes fishkeeping freshwater games habitat heart hobby hyphessobrycon instinct little live low macro male males natural nature negro ornamental pet piaba project red rio ritual side socolofi species tank tetra threat underwater vulnerable water