The placing of deep sand at the back automatically provides for three things. First, it looks pleasant, giving the aquarium base a gentle forward slope which best exhibits the content. Second, it provides for the largest plants to be sited at the back, where they are usually required. Third, it encourages the mulm to collect toward the front of the tank, whence it is easily removed.
Before use, sand must be very thoroughly washed. Even if supplied as “washed,” it will normally require some further washing. Really dirty sand may need 20 or 30 swirlings in fresh buckets of water, or half an hour’s thorough hosing in a shallow container. Failure to do this may cause cloudy water for weeks, or more serious trouble. European aquarists frequently use peat, loam, or earth beneath the sand, or in pockets of rock, to nourish the plants.
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Aquarium Supply
