I think the best medium is agar. It is a jelly-like substance that is obtained from algae, and is used to culture small organisms such as microorganisms and bacteria.
Hope this helps. :)
Explanation:
ln order for photosynthesis to happen, you need six carbon dioxide (co2) molecules, six water molecules (H02), and light energy. photosynthesis one molecule of sugar (c6H1202).
Not sure why that's an interesting one maybe it's a good thing to look it up on Google or something