Quality of water for Aquarium tank
Rain water free from contaminants or tap water is ideal for aquarium tanks. A tap water of domestic supply is likely to have chlorine which is harmful to fish. This water may be stagnated for about one or two days before use. If the water is hard it must be properly treated. The tank should be filled with the desired water without disturbing the bottom sand.
The aquarium tank after being filled with water can be planted with selected varieties of aquatic plants. The plants provide shade, shelter and sanctuary for fish. Besides decorating the aquarium tank, they also help in spawning and as food for certain fishes. The plants provide oxygen through photosynthesis. Over crowding of plants has to be avoided to ensure an adequate supply of oxygen to fishes. Several types of plants are available. Among them the important ones are the tall rooted plants such as Vallisneria and Myriophyllum. Before planting, the plants must be washed well otherwise disease causing parasites may attack the fish at a later stage. Plants may be disinfected by rinsing in 0.1 percent solution of alum (Potassium aluminium sulphate) followed by a good washing in water. The roots are trimmed and are kept between wet newspaper sheets to prevent them from drying before they are set. The plants are carefully installed using a forked wooden piece. Large plants like vallisneria may be planted at the back while the bushy plants can be placed in the corners or at sides. The floating plants may be necessary in tanks where gouramies are bred. The fragments of these plants are used by these fishes in the construction of bubble nests for breeding.
Light besides beautifying the aquarium helps in the photosynthesis of aquarium plants. Fishes also require light to trace their food. Further the light is known to influence the growth of fish. Strong sunlight destroys bacteria and keeps the tank healthy. For a moderate tank two bulbs of 60 watts each may be lit for eight hours a day. It is better to use fluorescent lighting for promotion of plant growth and for even distribution of light.