The degree of light should be carefully regulated by a stained glass
side, or a shade. Yet it must be borne in mind that sunlight is
indispensable to the free evolution of oxygen by the plants. And when
the sun is shining on the water, all its occupants appear more lively,
and the fishes seem intoxicated--as they doubtless are--with oxygen.
A novice is apt to overstock his aquarium. Not more than two
moderate-sized fishes to a gallon of water is a safe rule. Care, too,
must be taken to group together those kinds of creatures which are not
natural enemies, or natural food for each other, or a sad scene of
devastation and murder will ensue.
Cleansing cannot be always intrusted to snails. But the sides may be
scrubbed with a soft swab, made of cotton or wick-yarn. Deaths will
occasionally take place; and even suicide is said to be resorted to by
the wicked family of the Echinoderms.
To procure specimens for the aquarium requires some knack and knowledge.
The sea-shore must be haunted, and even the deep sea explored. At the
extreme low-water of new or full moon tides, the rocks and tide-pools
are to be zealously hunted over by the aquarian naturalist. Several
wide-mouthed vials and stone jars are necessary; and we would repeat,
that no plant should be taken, unless its attachment is preserved.
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