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adults algae animals aquaria aquarists attains a length Bade Badis balanced aquarium beef black spot black-banded blue body boiled bottom breeders bubble nest captivity Chanchito chopped clam climbing perch color common crustaceans dace Daphnia darters degrees dorsal fin eggs Enchytraeidae feeding female fish foods fresh water fresh-water gallon of water gills glass goldfishes gourami green guppies half inches Haplochilus hatch helleri home aquarium inches in length inches long infusoria killifish little fish live food Loach maculatus male meal worms meat mud minnow mud snail mussel native fishes nest oxygen paradise fish parasites parents pectoral fins permanganate Photograph by Dr ponds protozoans rainbow fish removed Rivulus roach rotifers sexes shell shellfish shrimp siphon snails sometimes spawning species specimens Stickleback sunfish surface tail tank temperature tropical fishes tropical toy fishes vegetation WALKING FISH weak solution weeks York Aquarium young fishes