Small Aquarium Fish - Water, A Haven For Life Turbidity
WATER, A HAVEN FOR LIFE TURBIDITY Clarity is more important in sea water than in fresh water. Tropical environments in particular contain very few dissolved solids and they are the most transparent waters on the planet. A marine aquarium must therefore be filtered more efficiently and to a greater extent than a freshwater tank (see Filtration, page 237). THE ORIGIN OF SALT WATER IN MARINE AQUARIUMS The first idea which springs to mind is that of collecting natural sea water, but this is difficult for somebody who lives a long way from a coast or requires large quantities. Moreover, although sea water does present advantages,it also has its inconveniences.While some aquarists filter it before using it to totally or partially fill up their tanks, the majority use reconstituted sea water. In theory, the recipe is a simple one: dissolve the salts in the water. In practice, however, not just any water or any salts can be used, and it is out of the question to use table salt or that derived from salt marshes. Furthermore, good sea water cannot be reconstituted using poor quality fresh water. Where and when to collect natural sea water? The ideal solution would be to go to the open sea, where the water is likely to be less polluted and to have more constant characteristics. Near the coasts, the following must be avoided: urbanized or industrialized areas and ports, which are susceptible to pollution; anywhere near river mouths, estuaries, or bays, where the water is desalted; and areas of stagnant sea water (pools at low tide) and salt marshes. Coasts with sand dunes are suitable in principle, but the water is often laden with suspended sediment. Rocky coasts are preferable regions from where water can be collected. The best periods for collection are autumn and winter, because plankton develop in spring and tourism increases the risk of pollution in summer. Calm weather is preferable, in order to avoid suspended material, although a heavy swell reoxygenates the water. In this case, the water can be collected 1-3 days later, the time in which the suspended material turns into sediment. However, the water must be filtered in all cases, first roughly and then more finely.
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