pearl cichlid swim in blackwater aquascape, popular south american healthy cichlid, easy to keep ornamental adult

geophagus brasiliensis cichlidae cichlid brazil aggressive territorial iporangensis intelligent omnivorous dominant dwelling dangerous colorful smart freshwater fauna swim water clear aqua aquarium petshop animal aquaculture fishkeeping business trade underwater decorative fish tank little instinct habitat overpopulate ecology threat protection ichthyology controlled conditions phlegmatic funny tropical monster male adaptable hobby space copy glass refraction community