Yes, wave power is OK for marine wildlife, because marine wildlife is adaptable, and can deal with the small change. Marine wildlife can adapt to waves that exist naturally, so they can also adapt to waves that exist artificially. For what is to be gained by wave power, the small inconvenience to marine wildlife is tolerable.
Wave power is still in its infancy as far as alternative energies go. Whenever there is a ground breaking new idea in how to harness energy from natural sources, there are always going to be bumps in the road in developing safe technologies. However, given enough time, research, and resources, we can make wave power safe for marine wildlife.