That clawing is most definately a sign of nitrogen toxcity. Affected foliage will remain distorted, just monitor new growth. RF your post is so far of. Not really any runoff to read or medium to flush as he is growing NFT(nutrient film technique) so you know in the future.
Not even close either. I wouldnt trim any green leaves, curled or not. That plant is not deficient...
Since we can only, watchhowyoudoit how about you do it without Hatin' or trying to inadvertantly make yourself sound like
you have all the answers. When in fact, you have told Jubbs1 nothing original, or of intellectual value. You actually gleaned off of the first two responses, to advocate your obviously profound arrogance
about your, " growin' skills. " Spare the definition also, because botany apparently is not your forte. For if it were we would be in mutual agreement that nitrogen over-fertilization results in extremely dark leaves with edgeburns redish brown in color, whereas nitrogen deficiency causes necrosis with yellowing, and browning dead spots.
Leaf curling is more often caused by overwatering. If roots cannot breathe properly, plants
will respond by curling their leaves in a process we call respiration aka breathing. This curling allows for the trapping of more air to be absorbed via the stomata. Therefore the plant needs to respire instead of transpire, it cannot photosynthesize CO2 with the glucosides (sugars), terpenes, anthocyanins, and carotenoids, such as the amino acids lutein, allanine, and tryptophan.
This means slow growth when the stomata are not wide open accepting CO2, no food is getting processed and coverted into active compounds. If you reverse this grower induced environmental harshness you will see a correction in all areas of production. Oh and Watchhowidoit, the salt in nutrients are in an ionic form and thus can permeate through the finest of material, accumulate thickly on the sides of reservoirs, pipe walls trays, netpots in aeroflow, soiless mediums, NFT is also used with rockwool which is a notorious PH issue to the begginer. and yes the fiber can also accumulate salts. NFT is not easy to master as well. Had I mentioned these things in the ORIGINAL response I made you wouldn't have been so inclined to show your UN-coolness bro. Hayah! Grasshoppa! Smoke some Anti-a-Hole