I don't think you should have a problem because that difference is not such a big deal. I have a 44gal tank that is off by just about that much and has been up and running for over three years without a problem.
Freedom is the sure possession of those alone who have the courage to defend it. -Pericles
Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of Liberty -JFK