Salt water fish aquarium

We finally changed over our aquarium. We found a good home for our huge coy fish and converted our aquarium over to salt water. The only problem with salt water, the fish is so expensive.We are going to start out with a small fish but even the small fish can set you back 200 dollars at the beginning. The three fish that I want from the beginning are a goby, hermit crab, and a bright red fire shrimp.