It could. It will depend upon the rock and sand and what else you are going to do to cycle the tank.
In effect, what your trying to do is take a short cut here. This can't really be recommended. You might get away with this, but it's more likely you'll end up with some sort of problem.
You would be much better off having another tank for your clowns while you cycle the existing tank. The temporary tank need not be as large.