I see them curling down which usually means you're feeding them too much. A small plant like that should only be getting 1/4 strength.
If by signs of nute deficiency you are referring to the spots on the ends of the lower leaves, that is a sign of an EARLY deficiency, as in, you waited too long to start feeding them at the very start. The deficiency stops just a little way up the leaf, so you can see when the deficiency ended. Those leaves will continue to look worse and worse as the plant grows even if it is perfectly healthy (damaged leaves cannot be repaired), so you need to concentrate on the new leaves and forget the older ones at the bottom.
The new growth seems to be fine, except that, as I said, your leaves are now curling down and you could very well expect some burning from the heavy nutes (heavy for that size plant).
This issue with early deficiencies is very common with growers new to hydro, I believe it is because they are following advice from soil growers on starting seeds. Soil growers do not have to feed right away as there is some nutrient already in the soil. Hydro growers have to supply very light nutes as soon as they see the first sign of true leaves (the first set after the seed leaves)
