Aquarius,
Don't worry, I'm confused naturally
There are some fish that will eat many invertebrates. Puffers and trigger fish are two. Common clean-up crew members include, hermit crabs (blue and red-legged), a combination of a coupe different species of snails, different kinds of shrimp, often a star fish, and there are other scavengers that you couLd look at.
In addition to being careful about which inverts you put in with which fish, you also have to recognize that these inverts are scavengers and your tank needs to have enough food sources in it to keep them alive.
Another issue is: how long has your tank been up and running? Has it completed the cycle yet?
Jim