Need Some Help! Plants Do Not Look Good

This is my first hydro attempt, I have had good success with soil, but wanted to try something new... The setup has been going for about a week now, I am using ebb anf flow setup with a 10 gal tank. I put the seedlings in large rockwool. I have good lights and just recently increased my feeding schedule to 3 x a day for 15 mins, durring light hours. (It was at 3x a day for 5 mins before)
Im using Botanicare Pure blend pro grow, 3-1.5-4

My plants are about 4 inches high, with a few sets of fan leaves, but they just dont look to good. I notice their color is fading a bit from a dark green to a light green, almost yellow. Then I noticed some yellow spots on the leaves. This made me think I had a N problem, so I increased the ferts to 3/4 of what they recomend for mature plants. I also just corrected my PH down from a 7+ to about 6..
Am i doing anything wrong? Any recomendations for me at this point?

* am i supposed to take the plastic off the sides of rockwool (sorry this is a dumb question)

* Can I use my Fox farms grow big fert for hydro? i had good luck with them in past..

Yes your ph is too high. How long has it been at 7? Needs to be 5.6-6.0. As for your fert ? don't think I can help you--what are the numbers? If your fox farms stuff is for soil than I wouldn't use it in hydro but that's just a guess. Fix your ph and keep it correct. It is incredibly important in hydro.
PS Dont know the answer to your rockwool questions so I guess I'm dumb too....never used it.

6.0 is better than 7. You dont have to take the plastic off. I think its better to keep it on. Helps with the mold. YOu dont want it on the bottom, but the top and sides are ok You are watering way too much. Trust me I know my rockwool. You will prolly need to manually water for a while. Untill they start drinking good. Rockwool will hold lots of water. It needs to be dried out like soil to work right. Watering once every other day is prolly more like it. But not for a while. You want the rockwool to get light, almost completely dry. You are thinking its clay pellets and thay need watering 3-4 times a day. As far as nutes go, you will need a good "hydroponic" fertilizer. A soil fert is not going to have all the nutes that water needs to support a plant.

I was wondering if i was over watering them, the rockwool blocks are very heavy from all the water they have in them. If I understand you guys correctly I have to let this almost dry out before I water them again? I will change the watering schedule asap. I also built a grid to hold them off the planter a bit as I noticed not all my water was draining out and the rockwool was sitting in a bit of water even after feeding. I put a fan on them too, hoping this too would allow the rockwool to dry out a bit.. I hope I didnt get root damage from all the water.

Stick with the Pure Blend Pro. Use the "Grow" through the veg cycle, then switch to the "Bloom" during the flowering cycle. Also, use CalMag during the flowering cycle. Here's the ratios PER GALLON OF WATER:

Veg: 15ml of PBP "Grow."

Flower: 15ml of PBP "Bloom."

CalMag: 5ml added to the "Bloom" during the flowering cycle.

By the way ... just wondering if you are using tap water or RO water. If you are using tap water, that may be your problem.

Vi

tap water is fine as long as the ppm isnt too high. all it will do is burn the very tip millimeters of the leaves

Is that what causes that?!

-Tek

yes it does. nothing really to worry about. widow actually explains it in his grow guide

Cool, my plants have this and always wondered...

Never really worried about it tho

Good to know tho

Knowledge is POwer!

lol
Peace
-Tek