bleeding heart tetra adult fish interact in blackwater biotope aquarium with beautiful plants, hard to keep freshwater fish

active adult amazonas animal aqua aquadesign aquarium aquascape aquatic barcelos basin beautiful behaviour biotope blackwater bleeding bright business care characidae clear cultivation cute decorative design dot driftwood dwarf eco ecology endemic fauna fin fish fishkeeping freshwater group habitat hard healthy heart hobby hyphessobrycon instinct interact keep little live low macro male natural nature negro ornamental pet piaba plants project red rio side socolofi species tank tetra threat underwater water