The difference in light is not that significant and bio-pellets are traditional in the sense that it is one item for a carbon source, no different than using vinegar, with no need in adding back a lot of anonymous additives. The form is solid instead of a liquid but other than that, there isn't a lot of difference and if Krzysztof had went with VSV the results would have been the same.
It is easy to say it is just because of a difference in light, but if you look at the corals and not just the sand you will see the color difference in the entire coral. One look at the top left of the tank between both shows this pretty clearly. It isn't the light that makes the green tips and brown patches on the stems, it is the brown patches that give the brown color, if it were just the light than the tips would also be brown.
In no way am I knocking Zeo, but for someone to suggest all the best looking tanks are Zeo is not very accurate. There are beautiful tanks with just about any methodology in use.
It is easy to say it is just because of a difference in light, but if you look at the corals and not just the sand you will see the color difference in the entire coral. One look at the top left of the tank between both shows this pretty clearly. It isn't the light that makes the green tips and brown patches on the stems, it is the brown patches that give the brown color, if it were just the light than the tips would also be brown.

In no way am I knocking Zeo, but for someone to suggest all the best looking tanks are Zeo is not very accurate. There are beautiful tanks with just about any methodology in use.