article: Forniture aquarium
It 's good to have in the aquarium, in addition to the plants (which will be discussed in next chapter), even rocks and roots to form a "landscape" to break the uniformity of a flat design. Although furniture is for the benefit of the aquarium fish, all the better if the environment designed also like to the viewer. You must take great care in choosing to use aquarium rocks, especially if you have to maintain the specific water conditions. Masses of jagged rocks may look impressive, but do not go well in an aquarium where the fish can easily injure themselves against the elements while you look so decorative. It is said that all the rocks of the aquarium should be well rounded, even the irregular but well-polished are in great demand. Once chosen, the rocks may be arranged in steps, terraces, or in groups to form caves and crevices, and you can also attach directly to the walls of the aquarium with silicone sealant. When placing artificial rocks, we must avoid a few pitfalls: the larger rock mass should be placed directly under the tank, do not lean over the gravel. Many fish are expert diggers and a rocky outcrop wavering can cause serious damage. Generally it is not good to put limestone water conditions (unless it is an aquarium with hard water fish that houses those who tolerate these conditions), but these are useful in marine rocks which help keep the pH at the right level.
Another useful material to decorate the aquarium is the wood. Some branches of trees appear, under water, old roots or submerged logs. You have to take some precautions in this case, you should only use wood very long, or the "petrified wood" or fossil that you can buy from dealers or aquatic products in the shops of florists. The wood tends to float, but you can remedy this in two ways: by boiling the wood for several hours, and then leaving it for several days (or weeks) in water changed frequently, and this not only makes the wood clean and free of parasites, but impregnated with water and then it does weigh more than water. Another method is to fix with a screw on the plastic strain or the branch to a thin piece of slate and then bury it under the gravel because it retains its weight on the bottom of the wood. There are also rocks and stumps on the market made from synthetic material, made from resins and their cast is made with a patterned stamp of a true strain of the branch. Such submerged structures are also useful to the fish to lay their eggs and as shelter, behind which the owner of the aquarium can hide some equipment, such as heaters or the speakers.