Although attention must be paid to the basic causes, such as overcrowding, gray cloudiness may often be temporarily corrected by brisk aeration or by the addition of disinfectants and anti- biotics. Another effective method with both gray and green cloudiness is to place one or two large fresh-water mussels in the tank for a few days. These will clear water when a filter will not.
Removal of Mulm
In the course of replacing some of the water at intervals of one or two weeks as recommended, it is easy to siphon off much of the mulm from the bottom of the tank. A convenient way to do this is to take a glass tube of 1/4 to 1/2 inch in diameter, slightly shorter than the aquarium depth if it is left straight, or a little longer if the top is given an angle bend, to prevent the rubber tubing which is attached to the glass tube from kinking. The business end of the glass tube should be softened by heat and then gently pressed onto a flat surface, holding the tube upright, so that the entrance is slightly constricted, to prevent pebbles, snails, and so forth, from getting into the tube and clogging it up. Any that do enter will be small enough to pass readily through the siphon. The rubber tubing should reach for 2 or 3 feet outside the tank below the water level, so as to give a convenient head of pressure.
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