Marks on the leaves

Hello,

I am finishing vegetation phase on my canalope haze strain(day15). I noticed a change of color on the leaves. There is only 5% plant like this but i want to solve the problem in early stage. I am using Athena pro line and work according their chart.

It's just variegation. It's common to see it on young seedlings, and often they outgrow it. Some plants only express it, or express it more, when it's unhappy with pH or whatever you're feeding it, etc.

Long story short, it isn't something to stress over too much.

You'll see variegation frequently in plants with Chem, Haze, or OG lineages (and I'm sure there's others too)

Most commonly I see it on young seedlings that quickly outgrow it. They look very similar to the variegation you're seeing.

Other plants, like the chems, og's, hazes, tend to express it in a repeating pattern, like maybe one blade of the fan leaf is half yellow every so many nodes.

There is some debate about whether it's a sign of stress, or viroids even. I think it certainly can be a stress indicator, but it's hard to say when some plants show it no matter what.

I'm seeing mottled green color, overall light green color, curling edges in the leaves (tacoing from too much light), and downward point tips at the ends of leaves.

I'm not that familiar with imbalances, nor with variegation, for that matter, but as the song says, "there's something happening here, but what it is ain't exactly clear*".

"clear" in the literal and figurative sense. The leaves on the plant in the first photo look to be out of focus—perhaps you could upload another one?

I think downward pointing tips are a sign of too much water (I'm a hydro grower so I don't get "watering") but the curling of the leaves on plant in the first picture could be from that plant getting a bit too much light. What's your lighting set up like?

*[checks OP's age]

Those are lyrics from an old people's song.