Maybe I'm missing something here, but aren't Al and Cu not effected by magnets? Seems to me you'd want something very permiable like Iron, permalloy or supermalloy (sp?). Then you'd want to wrap it in a sphere around the the pump so that it would conduct the flux lines around the pump instead of through your case and to your display.
Eheim pumps are indeed shielded. I can set my 1250 on top of my monitor or in physical contact with the glass diplay and see no distortion at all.
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