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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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