Agree Robin – no tanks in the attic for me. Before I could relocate the W/D from upstairs (house came that way) had a problem and ended up having to re-drywall and paint living room ceiling downstairs.
74 – forgot about the heat of black – than an opaque white. If algae grows in the tank it eventually plogs it up. My rain barrels are shaded almost all day by the eves and position of the buildings thank goodness. They came light tannish color.