Hi

I am growing tomatoes using hydroponics. My plants are about to give their fourth cluster. However, recently I recognized a problem in some of my plants. While growing newly emerging are twisting like a spiral and instead of being in a line they appear as a ball. Can it be related with the feed since I noticed a purple color in the bent areas of the petioles. But they are local. Until now there are no problems related with the flower or the fruit set.

I will appreciate any comments or suggestions.