| potresti mettere ghiaia e poi sopra sparsi ciottoli di differenti dimensioni a simulare il fondo di un torrente , ecco una descrizione per l'acquario dei guppy fatta da Heiko Bleher:If possible, obtain some fine white sand or light quartz gravel for the substrate –
 about a 2” layer is required, a little deeper at the back. First rinse your new tank well
 with warm water – no soap or detergent! – and check whether the sand has been well
 washed (regardless of what it claims on the packing). For decor we recommend a few
 nice pieces of bogwood and stones, and a
 good selection of attractive aquatic plants.
 Particularly good (and biotope correct)
 choices include Cabomba species and the
 Guiana willowleaf, Hygrophila guianensis
 (small-leaved willowleaf, H. polysperma,
 will do instead). The dwarf chain sword
 (Echinodorus tenellus) is ideal for the foreground;
 it will form a carpet above which
 the fishes will be seen to best effect. Alternatively
 you can use the somewhat larger
 dwarf swordplant E. quadricostatus (see
 below, left-hand biotope). And, finally, one
 to three specimens of the larger swordplant
 E. horizontalis or E. osiris (as in the lefthand
 corner of the biotope below left)
 which is highly decorative. You can also
 plant lots of Ludwigia repens (as in the
 biotope below right) - again very atractive
 decoration.
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