Why you shouldnt use play sand in a Planted aquarium. - YouTube

i wouldnt recomend play sand for a planted aquarium mainly ..
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Some aquarium gravels (such as Seachem Flourite and Onyx Sand) are designed for plants, but specifically for aquarium plants and have quite a lot of macro and micro trace elements in them (probably not good for CPs).
What Are Some Good Plants That Grow In Sand? | My Aquarium Club
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That’s an excellent point and I’d say that’s the only major downside to having sand substrate (that and maybe trying to anchor plants). And I’m glad to see that I’m not the only who has to be careful with my aquarium hobby. Though most of the time I just get in trouble when I show up with yet another fish, or new aquarium. Planted Aquarium Substrate - Black Iron Sand Unboxing - YouTube
Photo provided by FlickrAug 29, 2013 - A mixture of rocks, sand, smooth gravel, and aquarium planting ..
Photo provided by FlickrAdding Plant Substrate To Already Established Sand Aquarium
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Aquarium substrates, the gravels and sands of tankbottoms, perform several functions in planted tanks; as root anchors,ballast for weighing down nutritive soil, possibly acting as buffers,mineral sources, even inorganic catalysts! Heck, they also make thesystem a lot more natural and attractive. Imagine tanks with barebottoms; no thanks.The most common mistake made by beginners is to get the cheapest gravel they can find and a month later we ask ourselves why the plants are not growing well. A good quality substrate can be costly but will pay off in the end. All plants need a supply of Iron (Fe) to grow. Substrates such as and provide a long lasting supply of Fe to the plants through the roots. While each of these products can be costly per bag to buy, it provides you the best start to growing nice plants. I personally have used both with great success. Plants "will" grow in your average but the size of the gravel is very important. It needs to be a finer grain in size and it will also need to be fertilized to provide the nutrients to the plants. I would suggest a layer of peat and Laterite under regular aquarium gravel or sand to provide the Fe needed by the plants. When using this method you must take care not to disturb this layer over time. If it is disturbed and allowed to enter the water column you could create "nuisance algae" problems.Substrates are important; their depth, size, granuleshape and composition can make or break an otherwise ideal live plantset-up. Here are my ideas on what to look for and avoid in choosing andusing aquarium sand and gravel for the aquatic gardener.Free floating plants obviously derive nutrients directlyfrom the water, and this mechanism has been proved for rootedvarieties. However, the many beneficial functions of substrates inaquariums cannot be denied; for anchoring, aiding in filtration, actingas stores and catalysts for mineral and organic nutrients... and forlooks sand/gravel is a worthwhile addition.Now that I knew this sand would have no ill effects on my water parameters and I knew I could achieve the look I wanted in my tank the next step was to make this substrate more plant friendly. This is the expensive part... I chose Flourite as the base layer which can be used by itself or used in a "mix" as I did to ensure the plants would get some benefits from the rooting base as opposed to straight sand or aquarium gravel.Some plants and animals you may keep in your aquarium have strong preferences for either sand or gravel substrate. For example, many species of cichlids need sand substrate in order to thrive since eating particles of sand help them digest food. Goldfish, on the other hand, risk suffering from an intestinal blockage if they accidentally ingest sand and so should always be housed in gravel substrate. Aquarium plants also have preferences for sand or gravel, so make sure to research the needs of the plants and animals in your tank before committing to sand or gravel.