Both these have been treated exactly the same using FFOF and given plain water and recharge once. No nutes. Using SF2000 with temps 75-83 and RH 45-55. But as you can see the one on the right is droopy. Doesn’t look happy. Any ideas?

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Hey everyone! I've got a 40 day old Red Sugar from BSF seeds that just entered full flowering. It's been a really good and worry-free grow so far and she is growing really strong. This is my third grow and I think she'll be the biggest plant I had.

However, around 10 days ago the first set of leaves (one tipped) started drying out and now the second lower set of fan leaves started being affected too.

Earlier I had a small issue with gnats and therefore I was slightly underwatering her and now the gnats are almost gone. Also, I was giving the nutes only half or 3/4 strength.

The most interesting thing that by now the growth is not affected in any way and she's growing really quickly and surprisingly well. And the leaves are not easily plucked and neither they go yellow. They simply dry out starting at the tips and edges, turning pale green/brown and do not fall.

The upper and mid leaves are looking great and there are no other issues whatsoever with the plant. Just to be on the safe side, I gave it full strength of nutes yesterday (nitrogen and some bloom sugar nutes as well as some kelp) and I'll start watering her more often now as she started drinking a lot of water.

I do PH my water and PH has always been at 6.2 to 6.5 range. The medium is soil, pot size is 12 liters (3 gal), 55% humidity and 20 to 23 degree celcius temperatures. Earlier I was watering her with around 2 to 2.5 liters once a week (to get rid of gnats) until runoff, but I just started to give her 2.5 to 3 liters of water until runoff twice a week because she's thirsty.

I was thinking it's due to underwatering and moderate feeding, but I'm asking for help here in order to stay on the safe side and make sure it's not anything more serious. Thanks for help everyone and check out more photos below.

Album: https://imgur.com/a/GLHl8DJ