. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. gh to injure the fishes ifthey chance to be knocked against them. A Word to Beginners. It is much the better plan to start with a fewfishes of the hardier varieties until the rudiments of aquarium keeping arewell understood. If one can keep common goldfishes in perfect healthand experience practically no losses, then it is time to branch out into themore varied and interesting breeds. Some beginners, having more enthu-siasm than experience, lose valuable fishes at the start and turn away indisg
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. gh to injure the fishes ifthey chance to be knocked against them. A Word to Beginners. It is much the better plan to start with a fewfishes of the hardier varieties until the rudiments of aquarium keeping arewell understood. If one can keep common goldfishes in perfect healthand experience practically no losses, then it is time to branch out into themore varied and interesting breeds. Some beginners, having more enthu-siasm than experience, lose valuable fishes at the start and turn away indisgust from a fancy that, if properly understood, would have afifordedthem many hours of pleasant recreation. Aeration. In Nature there is alwayssufficient plants or air surface to keep the fishwell supplied with oxygen, but in the aqua-rium, particularly on dark days when theplants give off little oxygen, it is impossiblet« keep the fish from coming to the surfacewithout the help of some artificial is best accomplished by means of com-Air Pump pressed air liberated at the bottom of the. TROPICAL AQITARIIT:\[ FISHES U aquarium. As the air passes through tlie water there is sufficient oxygenabsorbed to keep the fish always in good condition. This is also veryhelpful to the fish at night. There are many varieties of pumps that can be used for this purpose,but the cheapest and most satisfactory are those which are operated bywater power. The type known as beer pumps are the best. These oper-ate on a very simple principle, having a minimum of working parts andtherefore little to get out or order. Air is forced out of an air-chamberby the entrance of water. When the air is all expelled, an internal floatstops the supply of water and starts a siphon working which empties thepump preparatory to the next filling. As this operation takes about aminute it is advisable to have a small storage tank for the air to passthrough in order to equalize the flow. A very small stream of ai
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