Only just now thought this up.
RE model has high-tide on opposite sides of the earth. The explination for this is funny btw. On one side, water is being drawn up by the moon's gravitational pull while at the same time on the other side of the earth, the earth is being drawn AWAY from the moon's gravitational pull.
Now on an FE model, the only explination I have heard in regards to tides is that the plate of the earth tilts slightly, this only explains for 1 side of the world's high tide at a time.
2 things need to be explained.
1) What makes the FE model tilt?
2) What causes tides on both sides of the FE model at the same time.
My suggested theory is that the moon and sun have a gravitational effect on the Earth, the Sun's being slightly stronger to cause the earth to be drawn upwards on one side, while the moon pulls the water up on the other side.
Half assed and not thoroughly thought through, don't get to proud of yourselves if you can find holes in the idea.