Aquariums are generally heated for the benefit of the fish, not the plants. Tropical plants usually need temperatures ranging from 66° to 77° F (19° to 25° C), which fortunately corresponds to the requirements of tropical fish. Aquatic plants from the temperate zone can all stand temperatures of about 68° F (20° C) except those from cold spring waters, which are not recommended for home aquariums anyway.
It is not necessary to go into details of water temperature in relation to their cultivation in aquariums with a temperature of 68° to 77° F (20° to 25° C). If we have an aquarium with fish from the temperate zone, the aquarium being left unheated in the winter and reaching low temperatures of 50° to 59° F (10° to 15° C), we should likewise use temperate plants from Europe and North America, At the other extreme are spawning aquariums where the temperature is often increased to 82° to 86° F (28° to 30° C); here only tropical plants can be used, as temperate or subtropical species die at such high temperatures.
For the greatest efficiency in heating, tubular submersed heaters should be used. These should be installed in the aquarium when the sand bottom is added and should preferably be covered by the sand. In this way uniform heating of all the water occurs as does heating of the substrate. Thus the plants have a constant temperature in both leaves and roots. Short heaters set vertically may heat only the water near the surface, while the bottom water and sand remain cold. By introducing circulation of the water through a filter or by heavy aeration, a uniform temperature is reached in the water but the substrate remains cold. In a cold medium the plant roots reduce their activities and assimilate a smaller amount of nutrients than is needed by the leaves, which are functioning in warm water. Cryptocorynes are very sensitive to these temperature differentials. We are convinced that this is a very frequent cause of "Cryptocoryne disease."
An undergravel filter draws the water through the sand substrate, removing temperature differences between the water and the sand bottom. The temperature of the whole plant body is thus about the same, a factor which favors the prosperous development of the plant.
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The word aquarium originates from the ancient Latin language, aqua meaning water and the suffix rium meaning place or building. Aquariums are beautiful and look good anywhere! Home aquariums are becoming more and more popular, it is a hobby that many people are flocking too and fish shops are on the rise. Fish are generally easy to keep although do they need quite a bit of attention. Puppies and kittens were the typical pet but now fish are becoming more and more frequent in house holds. In recent years fish shops have noticed a great increase in the rise of people wanting to purchase aquariums and fish, the boom has been great for local shops as the fish industry hasnt been such a great industry before now.