[Vray] Rendering water reflections?

Hi guys - I’m practicing my water rendering skills and tried to replicate a photo. Can anyone advise, how to create water reflections, like here on the wall? Also how to make the surface of the water more glittering?
I tried adding rectangle lights, etc into the water, above the water - but couldn’t achieve any…
How would you approach this task? Any ideas?

My reference pic:

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To start with, the sun should come more from the right, like in the photograph.

That’s called caustics…

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Great, thanks @alpro. Researched caustics :sweat_smile: here’s the result, still not 100% happy, but better already.