It cannot be turned down and there are no attachments except I could get a 45degree 50mm Elbow from Germany for you. I don't know how much they would be but they are almost as big as the pump itself. I would try different positioning and if this is a fresh sand bed the problem will go away as the sand bed matures. Be sure to keep the pump clean of sand as this will destroy the pump over time, until the sand settles clean it at least weekly. The Stream Rock could be another solution since it gives the pump a slight upward angle.
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