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aeration algae Anemia animalcule AP F aquaria aquarists aquarium aquarium plants aquarium water Armored Catfishes Axelrod bacteria bottom layer Breeding Aquarium Fishes breeding tank brine shrimp brood-caring carbon dioxide Catfishes Characins Cichlasoma clean color photos community tank Corydoras Cyclops decorations disease dried food Dwarf Cichlid eggs Emmens equipment feeding females filter filtration fins Fishes by Dr food animals glass Gourami gravel Guppies Hard Cover hard water hatch heater heating heating-rods Herbert inside ISBN Kahl keep Kuhli Labyrinth Fishes large Cichlids larvae light liter of water live food Livebearers Loach look males mulm nauplii nutrients oxygen pair Paramecium parasites partial water changes petshop pH value plastic pond pump red mosquito rinse roots rotifer sand siphon snails Soft cover spawn spawners species Stickleback swimming switch tapwater temperature Tetra Hyphessobrycon thermostat Tropical Fish Tubifex w-L A F water fleas white photos worms