Water Presence in My House's South Sector

[myfs_98480]

According to the Eight House theory, my prosperity sector is the South sector, and I belong to the East group, and so is my wife.
Water usage for the whole house comes from a 500 litre water tank at the second floor. Most of the family members' activities are on the first floor, and the second floor's area is only 1/4 of the first floor's. However, the water tank on the second floor is at the South sector of the whole house.
Understanding that water is not good for the South sector, what can I do to correct the problem? I thought about hanging a Swarovski window ornament on the second floor, to counteract the bad chi due to presence of water. Do you think this would be advisable? Note that the second floor is see-through, i.e. it's ceiling is only a see-through plastic-like material, so the sun's rays are very direct on the second floor. Thank you.