How clear reef tank water can be?

[BurgerFish]

Appears to be the glass.... your water is clear in those cups

But on my photo you can see the glass upper the water line, no green/yellow at all.

 

[terraincognita]

But on my photo you can see the glass upper the water line, no green/yellow at all.

Optical illusions.

It's your glass.

On the plus side, your water is crystal clear :D LOL

 

[Garf]

It’s probably green light bouncing off the glass from your green rocks.

 

[Fishnchips]

The good news is your water looks awesome.

 

[BurgerFish]

It's your glass

I tested that many times:

When I look trough the glass there is no green or yellow.
Only when there is a water the color become greenish.

It’s probably green light bouncing off the glass from your green rocks

Is there any way to fix that?

I think I need to do the bucket test to be sure, glass can be too small to see the green/yellow water.