What kind of gravel can be used for aquariums?

Planted aquarium substrate & gravel design. 2 different types (2 of 4)
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This substrate type is ideal as a lower layer for planted aquariums. Since it has a tendency to compact itself over time, it should be mixed with laterite or common aquarium gravel to maintain the porous structure.
Here are a few pictures of Aquarium Gravels I have used and recommend:
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Ceramic aquarium gravel-making has been the full creative catastrophe, with a happy ending. I’ve worked harder both physically and mentally and it’s taken scads more time than expected. Ironically, this gravel is only a bit player – pun intended – in the finished ceramic Aquarium Set-Up For Sale piece I envision. In that respect, it’s like fine silk lingerie, something usually only the wearer knows about, but great for self-confidence. There are several reasons why you should clean aquarium gravel:
Photo provided by FlickrWhat’s your choice to be dubbed as the Best Aquarium Gravel Cleaner?
Photo provided by FlickrLiberty Pebbles Aquarium Gravel
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In short, either is suitable. Sand is popular with serious aquarists, though aquarium gravel is still widely used. Sand is more natural-looking, and, with proper filtration, easier to keep clean. Waste sits on the surface rather than falling deep into the substrate. Well-positioned filters can pull waste from the surface, reducing the need to vacuum. Care must be taken to avoid sucking sand into filters and aquarium vacuums. Gravel needs to be cleaned more often but stays in place better in cleaning or if you have fish who like to stir up the substrate. If you are using under-gravel filtration, gravel is required.A is a piece ofaquarium equipment. It is a rigid, plastic tube, generally about 2" indiameter which attaches to one end of a to allow you to clean the debris from part of the aquariumgravel with each of your .A planted tank needs about a one-inch nutrient layer on the bottom (vermiculite or laterite), covered by about a two-inch layer of gravel or sand to protect nutrients from washout and to hold plants in place. Laterite happens to be an ingredient in traditional non-clumping cat litter, but purchase laterite that is prepared for aquariums; cat litter may have perfumes or clumping agents. Also available are prepared substrates with blends of components selected for planted tanks.There are kinds of fish that actually prefer dark or light gravel, or that like to camouflage themselves on it. In general, however, most fish don't care what color their gravel is. There are natural and bright colors for gravel, from sandy browns to orange, purple, blue, and multicolor rainbow mixes. The color preference is really up to you and will not have any substantial effect on the fish, though you will need to be more careful when choosing what material your gravel is made of. Some types of gravel are only suitable in freshwater aquariums, and there are types that are only recommended for saltwater aquariums. There are kinds that are specially formed to help your live plants thrive. There are some, like coral, that actually influence the pH of the water.There are several things you need to keep in mind when changing your aquarium gravel. With proper preparation and careful execution, you can make the switch without harming your fish.Gently extract the gravel vacuum from the gravel, keeping yourmotion as straight as possible. Again, shaking the vacuum around orbouncing it up and down will just release the debris from the gravelinto the aquarium water, rather than into the through the siphon. Your goalis to be removing this debris from the water, not loosening it up intothe aquarium.