hanging/drooping leaves

I'm pretty new at growing. I'm a month into Veging, I only have 3 plants, and I noticed one plants leaves are starting to hang down. I did test the PH of the water and it was off. I correct the PH but is this a PH problem?

Hard to tell without pics and info, from what you say could be over feeding or heat stress but without info or pics, who knows.

Do you have any pictures? Are they all the same strain? What nute values and how much are you feeding them? What medium are you growing in? When people make these kind of posts its not a wonder you haven't gotten a single reply yet. Hey gotta question, my vehicle started soundin funny the other day, I've had it for a couple months, thought it might be out of gas so I put a gallon in and it still sounds funny. Johnyjohny whats wrong with my vehicle?<<<<< See what I mean???

Sorry about being so vague I'm not sure of the strand because I got the seeds free, I didn't want to spend $ on seeds when I've never grown anything. The plants are growing in 4" rockwool, I'm feeding everyday with a 3-2-6 solution mixed in water (2 tsp per gal.) with a PH at 5.5. When watering i just keep the rockwool evenly moist, the bottom is always more moist then the top so i just water enough to get the top back moist. a 1 1/2 cups of water get the tops back moist. Their on an 18/6 schedule under a T5 fluorescent. They sit in container that's been fitted with computer fans for ventilation & lined with mylar. The lid of the container holds the light above them. Humidity's high is 58, low 46, it generally sits at 50%, temp sits at 77. That's basically the whole deal. Pix below show the drooping leaves on the biggest one, the other smaller two aren't doing it. Also is there anything else i could be doing? Thx in advance.

View attachment 2766729View attachment 2766730View attachment 2766731View attachment 2766732View attachment 2766733