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Coldwater marine fish are the fish that
you find in the sea. Because only a little equipment
is needed for this system and the fish can be collected
for free the coldwater marine aquarium can be very
cheap to set up and maintain.
Many species do tend to have dull colouring
but they have many intriguing habits that make them
appealing. These fish can grow very large very quickly
and will often outgrow small tanks. Once they do grow
to big you can return them to the sea and restock.
You can add many seaside creatures to
your coldwater marine aquarium like crabs, anemones,
starfish and shrimps.
Your tank will not need heating but
will require some filtration. In the natural environment
the moving sea creates the filtration the fish need
so you will have to replicate this and also aerate
the water.
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