rust corydoras pair explore java moss on aquarium bottom, south america endemic, popular fish from acid blackwater habitat

corydoras rabauti rabaut 039 callichthyidae cory cat cleaner bottomdweller corydoradinae barbel cleanup crew aquarium trade commercial ornamental peaceful omnivore adult freshwater pet endemic colorful fauna water natural animal aquatic fishkeeping business fishery aqua farming hobby underwater decorative fish tank bright instinct habitat ecology timid nature protection careful exotic tropical design aquascape space shallow depth field blurred background glass refraction rust pair explore java moss bottom south america popular acid blackwater biotope planted oxygenate air bubble low light bokeh