. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 71. The Chaxchito {Hcros facctus). Fig. 72. Polyacanthus dayi Upper Fish, T (Male)Lower Fish, o (Female) TEOPICAL AQUARIUM FISHES 105 If one is not blessed with a heated greenhouse or a room of warm,even temperature, artificial heating becomes necessary. There are severaldevices which accomplish this purpose, but only a few are general those are to be avoided which concentrate the heat on a smallportion of the aquarium water. This action drives out oxygen and otherlife-givi

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. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 71. The Chaxchito {Hcros facctus). Fig. 72. Polyacanthus dayi Upper Fish, T (Male)Lower Fish, o (Female) TEOPICAL AQUARIUM FISHES 105 If one is not blessed with a heated greenhouse or a room of warm,even temperature, artificial heating becomes necessary. There are severaldevices which accomplish this purpose, but only a few are general those are to be avoided which concentrate the heat on a smallportion of the aquarium water. This action drives out oxygen and otherlife-giving qualities and also produces uneven temperature for the fish to ^^h

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