I would say only going by the pictures, its heat stressed and stunted. If you can try to keep your grow room below 85f and transplant her into soil with some perlite.
Thanks I normally put my finger in so far to see if it's dry a inch or 2 down and check the weight of my pot also iv been giving them half a ltr then a few days late when it drys out I add a other half a ltr with my biobizz grow
i dont think your over watering at all. i use the biobizz line up as well i actually have a grow journal going right now with biobizz products you can check out. what soil are you using? Be careful with the biobizz grow it is very strong stuff. I would use a third of what the bottle recommends behind the label at most. Definitelyyy looks like heat stress.
3ML per liter is definitely to much imo i believe thats what the label recommends i did that on my first grow and the i burnt my girl up a little bit. put a fan blowing right on the light it will help.
yea maybe start with just one ML its easier to go up then down. I would even probably flush here really well with fresh clean water. What kind of light and how far is from your plant?