.0037" - .0243" if the Suns orbital rotation is indeed following the proper lunar calender. If things get delayed in orbit the growth will change exponentially. One fish will grow and the other will actually get smaller, you see with gravity and the fish tank you must take into account oxygen starvation. The pressure inside the fish tank will be greater on one fish than the other due to interstellar star trigger syndrome. This happens when the flake food becomes lodged in the filters orbital path causing the moon to skip a rotation. Upon happening the fish will actually revert back to it's previous life form, a small harbor seal who was eaten by a nearly full grown Great White back in 2005.
So in short, no one can tell you or answer this.
For optimum growth simply keep the water as clean as possible (Weekly 25-50% water changes) and feed a wide varied nutritious diet (Multiple different pellets, flakes, and other foods). This will equal happy healthy fish who will grow as fast as their genetics and conditions will let them.
