The dependence of the spatial distribution of inclusions in melt-grown Gd2(MoO4)3 crystals on their rotation rate is studied experimentally. It is found that the fluid flow under the crystal stabilizes the interface and prevents the formation of macrosteps if its direction is opposite to the direction of step propagation and vice versa. If the crystal diameter is about 1-2 cm, at high rotation rate the interaction of the fluid flow with the macrosteps is found to be strong enough to govern the form of the latter, which is determined mainly by the flow direction. The effect of stabilization of the interface by increasing the speed of the forced convection flow is discussed.