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As time passes, water evaporates from the aquarium and needs to be
replaced. Fill only with freshwater because the salts do not evaporate.
Salinity can easily be controlled by using a refractometer. Organisms found in Swedish waters have adapted to lower water temperatures
than are normally found indoors. A simple cooling method is to use
an old refrigerator. In the refrigerator it is possible to have a
container with sea water that is connected to the aquarium via a few
tubes through the wall of the refrigerator. Circulation is accomplished
with the use of a simple pump. The water in both the refrigerator
and the aquarium must have the same level, otherwise one of the containers
will flow over. If you want to make it even easier, freeze packs can
be placed so they float in the aquarium. The packs should be exchanged
daily.
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