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abdomen active Anabantids anal fin Angelfish Aphyosemion Apistogramma aquarium fishes average Barbs become belly Betta blue bottom breeding tank breeding tube brood brown bubblenest bubbles catfish caudal fins caudal peduncle Characins clean color community tank condition Corydoras courtship Daphnia dark develop Discus dorsal fin dried foods Dwarf Cichlids eggs eggs are deposited eggs are released embrace feed female's floating flowerpot free swimming freeze-dried foods freeze-dried fry food freeze-dried Tubifex gill covers gonopodium Gouramis gravel green hardy hatched brine shrimp inches Infusoria live foods livebearers male male's mate mouth mouthbreeders native Neon Tetra newly hatched brine newly-hatched brine shrimp nudges pair parents peat moss pectoral fins pre-spawning Prior to spawning quivering reach a length ready to spawn released and fertilized rock side slightly acid smaller soft species sperm spot stripe surface tail takes place temperature Tetras Tubifex worms usually weeks yellow yolk