I had this problem and my sump is too small for baffles.
What I did is put pipe fittings on the end of the drain so the drain forms a "U" at the bottom, so the drain outlet is facing up. I brought the drain in along one side of the sump and pointed the "U" at a tilt against the wall of the sump. The water blurbs up, hits the wall, and gently runs into the water. It solved the problem with no baffles and no nitrate factories... err... I mean sponges.