In article , Greg Bunch wrote:
Don't use fish to cycle a new tank! It is an unnecessary and inhumane
method, increasingly frowned upon by serious aquarists.

I agree.

If you are cycleing with live rock some people recommend a
piece of shrimp or other seafood from the deli counter. Others
recommend that nothing is needed to cycle the tank as the die off from
the live rock will be enough to start the cycle.