Ключевые слова: animals, aquarium, aquatic, aquatic plants, behavior, biodiversity, biology, close up, colorful, ecosystems, environment, exotic, fin, fish, freshwater, gills, gravel, habitat, marine, natural habitat, nature, observation, ornamental, personality, pet, pet care, relaxation, scales, schooling, serene, species, swimming, swimming motion, tank, texture, tranquility, underwater, underwater world, water, wildlife,