. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. 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 air run-ning through the aquarium will keep the water sweet even though theaquarium is somewhat overcrowded. Overcrowding, however, is not tobe 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 toplace a
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. 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 air run-ning through the aquarium will keep the water sweet even though theaquarium is somewhat overcrowded. Overcrowding, however, is not tobe 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 toplace a piece of bass wood or other open grained wood in the end of atube 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 aquariumor to make a fountain without the use of water other than that alreadyin the aquarium. (See Chapter on Aquarium Appliances.) Scavengers. Xature has supplied us with means of getting rid ofmost of the harmful offal and decomposition in the aquarium. These con-. FiG. 2. African Fig. 3. Japanese 4. Red Ramshorn The Three Best Freshwater Aquarium Snails {Life size) sist largely of those species of snails that do not attack the plants. Amongthe best known, most satisfactory and easily obtained are the large Japan-ese snails {Viviparous mallcatns), the so-called African paper shelled 12 GOLDFISH VARIETIES AXD snail (Lymuaea auricnlaria) and the red variety of the European Rams-horn Snail (Flanorbis corneous). These are all active in eating vegetablegrowth from the glass or particles of food which the fish have not taken,and in no case will they injure any of the aquarium plants. The Japanesesnails are very interesting in that they bring forth fully developed youngabout the size of a pea. These snails are male and female, but a femaleonce impregnated seems, like a queen bee, to remain fertile for theremainder of her life. The right horn of the
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