what type of corals should i use?

The link goes to salt. You mix salt with water to produce something like sea water. There are many things, cost, type of life you want in the tank, personal preference, etc. that go into selecting a salt. The Red Sea Pro is on the expensive side and geared toward coral growth.

With a cold water tank corals will probably not be that important so the expense of a salt designed to promote them is probably not what you want.
 
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