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aerate affected fish annually in favourable aquarist aquarium Azolla backbone Breeding condition Calico varieties captivity caudal fin clean coldwater fish colour Comet Common goldfish depth diet Dorsal fin eggs emergent plants fancy varieties Feeding ring Fin rot fish capacity fish food Floating plants fungus garden pond gill covers goldfish feed growth of algae Hardy goldfish Hornwort Icthyopthiriasis inhibit the growth land vertebrates leaves less hardy Lionhead median fins mercurochrome Novice fish keepers Oranda oxygen level oxygen starvation pectoral fins planting baskets plants for ponds plunge fish pond Goldfish ponds and aquaria Ponds will need pool liners protective body covering provide shade rhizomes Saprolegnia p 24 selective breeding shallow margin shallow pond margin shelter Shubunkins Spawning Submerged plants sudden change sudden temperature fluctuation summer surface area Swim bladder disease tail fin Telescopic-eyed Moor treatment p 24 Veiltail visibly scaled Fantail water fleas water lilies water plants water temperature young fry