Stromatolites

Question: 

I have bought a stromatolite fossil to include in my prayers and ceremonies to strengthen oxygen in the atmosphere by proxy magic. What is the best way to nurture this ancient rock? 

The Seer:

Put your stromatolite rock on your windowsill in some pure chlorine and fluoride-free water in the sunlight. Cover the entire rock with water.

From Google: 
The term stromatolite means “layered rock”, these are solid, rocky structures created by the activity of colonies of single-celled bacteria, mostly cyanobacteria, which were formerly known as blue-green algae. … As the stromatolites absorb sunlight they are able to break the chemical bonds in water releasing oxygen.