Agree pairing w/ a natural host match is always preferred, and if your tank is that new you should wait, and read a lot as to what fits you and your tank best.
Read what each nem needs in care, rock or sand bed, light and flow, and what works in your already built tank, and what it's natural clown fish would be would be my advice at this point.
Many like me that focus on clowns and nems build the tank to suit the needs of what we plan to keep, and that is usually thought out in advance before building the tank.