What else do you have in the tank?
How long has it been set up?
What type of clowns?
But, assuming that there are no other fish in the tank, and that it has just finished its cycle, there is a chance (( mainly because of the size of the tank )) that you will get a spike. You are going to have to test the water daily -- to see if you are getting an ammonia spike, and if you are, do a water change. Could do as much as 5 gallons.