. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. TEOFICAL AQUAEIUM FISHES 11 aquarium. As the air passes through the water there is sufficient oxygen absorbed to keep the fish always in good condition. This is also very helpful 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 by water power. The type known as "beer pumps" are the best. These oper- ate on a very simple principle, having a minimum of worki
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. TEOFICAL AQUAEIUM FISHES 11 aquarium. As the air passes through the water there is sufficient oxygen absorbed to keep the fish always in good condition. This is also very helpful 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 by water power. The type known as "beer pumps" are the best. These oper- ate on a very simple principle, having a minimum of working parts and therefore little to get out or order. Air is forced out of an air-chamber by the entrance of water. When the air is all expelled, an internal float stops the supply of water and starts a siphon working which empties the pump preparatory to the next filling. As this operation takes about a minute it is advisable to have a small storage tank for the air to pass through in order to equalize the flow. A very small stream of air run- ning through the aquarium will keep the water sweet even though the aquarium is somewhat overcrowded. Overcrowding, however, is not to be encouraged at any time. The air should be liberated in as small bubbles as possible. Libera- tors are made especially for this purpose, but a good home-made plan is to place a piece of bass wood or other open grained wood in the end of a tube to force the air through it. In case the liberator becomes clogged up, allow it to dry out for a day or two. An air pump may also be used to operate a filter for the aquarium or to make a fountain without the use of water other than that already in the aquarium. (See Chapter on Aquarium Appliances.) Scavengers. Nature has supplied us with means of getting rid of most of the harmful offal and decomposition in the aquarium. These con-. FiG. 2. African Fig. 3. Japanese Fig. 4. Red Ramshorn The Three Best Freshwater Aquarium Snails {Life size) sist largely of those speci
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