Sorry images were snapped on a poor quality camera phone but if you look closely you will notice the new leaves are canoeing, curling inwards and heavily stunted.. Please tell me it's not root aphids or something like that quick please guys!
There is a guide about how to post in the infirmary and what information to include so others are more able to help with correct information via taking into consideration your variables.
To answer your question, based on what you have shown, they appear to be cannabis seedlings. Aside from that, I'm not sure what you mean.
Without knowing anything about your set up, your media, your growing style, your temperatures, your watering frequencies, etc, etc, etc...it becomes literally impossible to provide an accurate diagnosis.
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If I had to guess based on what I see though, perhaps you are just over watering, Suffocating the roots and preventing nutrient uptake. Or the opposite, you let it get far too dry and they began to cannibalize themselves by pulling nutrients from the leaves to sustain. Could be pH related, locking out nutrition.
And then on transplant.. Or at least they were getting all fk'd up like that after just one watering.. Just watering upon planting, that shit holds so much water it's ridiculous!
Seedlings can hardly drink as they hardly have leaves to drink through, so one overwatering in some mediums and containers is all it takes to drown the delicate roots.
Cannabis prefers a light airy soil. 18-30% of a media is generally drainage amendments. If your soil is staying too saturated, that could be the cause of the problem.
They look like something of a trainwreck. They're growing, they're not getting enough nutrients, and there is light/heat damage (partial chlorosis of one leaf), probably because they're not getting enough nutrients.
The media you've mentioned - perlite, coco coir and canna terra pro have very little nutrients in them.
Also, it's always good to add a couple of tablespoons per 2 gallons of soil of magnesium lime to the mix, and let it rest for a week or longer. It will raise and buffer the pH and supply calcium for cell growth and magnesium for chlorophyl production. Chlorophyl is what makes plants green, and helps with phototropism.
With both coco coir and soil mixes like canna terra pro, it is always best to soak them in water for at least a couple of days. That way the medium isn't drier than the roots, which can lead to symptoms of nutrient deficiency/lockout.