Let’s take a closer look at some of the different types of modern aquariums that you might come across.

First of all we should say that to a large extent the tired old fish bowl has, thankfully, entirely been replaced by the rectangular glass aquarium, either made entirely of glass or with a steel framework and glass sides and a bottom of glass, slate, or similar inflexible material.

Except when used for spawning, for exhibit purposes, or as a hospital tank for the treatment of disease, the fish tank contains growing, rooted plants. These plants are embeded in a sand or gravel layer 1 or 2 inches thick. There could be ornamental rocks, however the principal design is generally the plants themselvesand these certainly contribute more to the eye-catching appearance of a well set-up fish tank.

Rectangle-shaped aquariums are normally between 5 and 25 gallons in capacity; a 15-gallon aquarium measures 24 X 12 X 12 inches and this is a popular size. Any smaller sized fish tanks than this can not house lots of fish or enable proper advancement of the plants either.

Larger fish tanks are really eye-catching and give scope for lovely planting arrangements and for perfect growth of the fish. However, they are pricey and therefore beyond the reach of many, although there are a number of companies, like this one - visit website - that offer aquarium rental, which is an alternative option to buying. As a result of the higher cost of the very large aquariums, most fish fans consequently favour one or more medium sized fish tanks instead of one of the huge ones it has to be highlighted that the larger aquariums do offer the possibility of housing much larger types of fish, so the choice of tank should really be governed by which fish you want to keep. There are also many other different shapes of aquariums that can be considered too, of course. For example, slimline or column aquariums can be ideal where space is somewhat limited. Just as for the rectangular aquariums, you can also find column aquariums for hire too, if you prefer this to buying one.

As a whole, exotic fish can be housed in smaller sized fish tanks than cold-water fishes. This is due to the fact that they are normally smaller and are additionally better able to withstand a relative deficiency of oxygen in the water.

Size for size, many tropical fish can be kept in more crowded conditions than the typical goldfish and very much more than fancy varieties of goldfish. at the most, and no more than a pair of Orandas of the same size.

Fish take in solid food and excrete solid faeces. They breathe oxygen and exhale carbon dioxide, and therefore they have the tendency to deplete their environment of oxygen and to contaminate it with co2 and also excrement.

Plants also breathe oxygen, but in sufficiently strong light they make sugars etc., from co2 taken from their surroundings, whether air or water, and they release oxygen.

Plants likewise soak up dissolved salts as well as utilise these together with carbon dioxide in building up complex natural substances. Few higher plants can utilise solid or very complex compounds, and before the fish waste matter is readily available to them it needs to be broken down by fungi or microorganisms to make it soluble.

So plants, in adequate light, tend to bring back oxygen to the environment as well as to remove the waste products of the fish. In poor light or in darkness they deplete the water or air of oxygen just as the fish do. It is just in the daytime, or under bright artificial light, that they perform the complementary function.

From these facts grew the principle of a balanced fish tank, with the waste items of the fishes taken in by the plants, and also the oxygen essential for the fish being supplied by the action of the plants in light.

So, as we can see, a well-planted aquarium with adequate illumination will usually remain clear and provide a pleasant habitat for the fish for months or years with little attention.

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