. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. 10 GOLDFISH VARIETIES AND for about two weeks, this being particularly true of imported goldfishes. They may already be inoculated with diseases only in process of incu- bation, but which will nevertheless develop. Chemical Depletion of Water. Constant absorption of minerals from the water by plants and fishes makes a condition which should be provided for. This can be done by the occasional addition of salts. Make a mixture of three parts of evaporated sea salt (Turk's Isl
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. 10 GOLDFISH VARIETIES AND for about two weeks, this being particularly true of imported goldfishes. They may already be inoculated with diseases only in process of incu- bation, but which will nevertheless develop. Chemical Depletion of Water. Constant absorption of minerals from the water by plants and fishes makes a condition which should be provided for. This can be done by the occasional addition of salts. Make a mixture of three parts of evaporated sea salt (Turk's Island Salt), and one part Epsom salts. About once in two or three weeks a level teaspoon- full to 20 gallons of water will prove beneficial. Usually the fishes will greedily swallow these salts as they sink to the bottom, which acts as a mild cathartic with them. The decomposition of plants, etc., sets up an acid condition in the aquarium, which is not good for the fish and which causes most of the crumbling noticed on the shells of snails. Ten drops of lime water to the gallon of aquarium water will neutralize any ordinary acid condition, but a better method is to keep a small piece of Plaster of Paris in the aquarium. In dissolving, it neutralizes the acid, but as it only dissolves under acid conditions, there is no danger of getting the water too alkaline. If the Plaster of Paris dissolves quickly it is a sign of pronounced acid condi- tion. We would call two weeks a short time in which to dissolve a piece half the size of a shellbark in a 20-gallon aquarium. Pieces of gypsum will perform the same function, but more slowly. Pieces of coral, sea-shells, etc., look out of place in a fresh-water aquarium, and many of them are sufficiently rough to injure the fishes if they chance to be knocked against them. A Word to Beginners. It is much the better plan to start with a few fishes of the hardier varieties until the rudiments of aquarium keeping are well understood. If one can kee
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