Is it safe to consume salmon every night?

In general, yes: But it depends on where the fish is from. Stay away from fish from the pacific! because of fukushima, which is still spewing incredibly high amounts of contaminated sea water into the pacific, i would stay away from any seafood from the pacific. But in general, salmon is one of the best and healthiest fish to consume; it is loaded with omega-three fatty acids and other antioxidents.