The most commonly use aquascaping objects are rocks, and driftwood. Rocks composed of sandstone, granite. quartz and also slate are good choices. They are readily available in most pet stores. Sometimes rocks will have sharp edges on them that, like sharp gravel. can injure your fish. You can solve the problem by rubbing the sharp edges of one rock against another rock to dull them. Don't use rocks of unknown composition in your aquarium. lt could spell disaster for the inhabitants of the tank. Some rocks contain substances, such as copper or other elements, that can be harmful to the fish. Limestone, marble and gypsum rocks, for example, would not be good choices for use in an aquarium. There are some exceptions to the general rule, but they usually pertain to African rift lake cichlids that benefit from rocks that make the water harder. Give some thought to where you want to place the rocks, and what purpose they will serve. You may have a particulary large rock that is impressive in appearance and could be the focal point in the tank. Or you may have a number of smaller rocks that could be used to create a cavelike effect. If you plan to do the latter, it's a good idea to glue the rocks together with aquarium grade silicone cement and to let it cure for at least 24 hours before putting the assemble mass into the tank. Silicone or not, make sure that all the rocks you place in the tank are firmly supported by the substrate or by other stable rocks. You don't want to have one slip once the tank is filled with water and fish ! If you crack a pane of glass in your aquarium it could leak. If you happen to be away for a prolonged period of time when it happanes, much of the tanks's water could end up on your living room floor before you return. Also, think about thefact that anything you put into the tank displaces water. This is not as critical in very large tanks, but you may find the fish-carrying capactiy in smaller aquariums significantly reduced by the presence of many rocks in the tank. Because an aquarium of a given size can only be home to so many fish of a certain size, the more rocks, driftwood and so on that go into the tank, the fewer the number of fish it can safely hold. The proper placement of plants, driftwood and rocks can help to hide or disguise the filter tubes, heaters and other items typically located at the rear of a tank. Rocks and driftwood can also serve as walls to contain stepped (terraced) levels of gravel. Driftwood always creates a nice effect in an aquarium, and is essential when keeping suckermouth catfish, which gnaw on driftwood for specific nutritional needs.
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