No idea whats wrong: leaves look kind of yellow

Hey guys,
Heres a few details about my grow:

Plants are at week 3
Strain = caramelicious
Soil PH = 6.8
Water PH = 6.5 or as close as i can get
2 36w cool white floresence
Lights are on 24/7
Soil is royality mix
The humidity = 65%
temperature = 65f

They got some MG at half strength 3 days ago. But still looked a bit like this. If im forgetting any info please tell me.

Thanks

Here is the pictures

Could be the start of a mag defficiency?

look under the leafs, any small black or red dots sucking out your leafs? that's how mine started to look right when spider mites appeared. if not.. may be a nute problem. good luck my friend

HerbalBeast said:

look under the leafs, any small black or red dots sucking out your leafs? that's how mine started to look right when spider mites appeared. if not.. may be a nute problem. good luck my friend

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no nothing under the leaves

and as for a mag defficiency id have no idea

Might be nute burn. What's the make up of your fertilizer? Also, ALL pH levels should fall within 5.5-6.5, so your soil pH is a little high.

Fuzzbutter said:

Might be nute burn. What's the make up of your fertilizer? Also, ALL pH levels should fall within 5.5-6.5, so your soil pH is a little high.

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MG = 6-5-5
so my HP is a bit high will it help if i get my water ph lower will it help change the soil?

Not really unless you're using only perlite. If the plant has been good till now I doubt it's the soil, there are ideals, but individual plants adapt well to ranges not in the ideal. All I know is that your fert is no good. You want to get one as close to 20-5-14 for vegging as you can. Close to 5-15-14 for flowering.

most fertilizers will lower the ph of the water when you add them to the water wich will lower the soil ph over time

I was actually about to ask about that, what is the pH of your fertilizer? Before I fertilize my plants I pre-mix it and test the pH, it's normally about 4.5, I then level out the pH to 6 before feeding to my plants.

Fuzzbutter said:

I was actually about to ask about that, what is the pH of your fertilizer? Before I fertilize my plants I pre-mix it and test the pH, it's normally about 4.5, I then level out the pH to 6 before feeding to my plants.

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ive never tested the mix. so as for what is wrong with my plant what will i do.

get a better fertilizer, pre-mix it and test before giving to your plants, adjust the pH as necessary, see how they do. They don't look like they;re going to fall over and die anytime soon.

Fuzzbutter said:

get a better fertilizer, pre-mix it and test before giving to your plants, adjust the pH as necessary, see how they do. They don't look like they;re going to fall over and die anytime soon.

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any idea on what fertilizer i should buy

I use General Hydroponics Maxigrow, it's good for both hydroponic and soil use. It's levels are 10-5-14 and my plants are just eating it up. Pretty much just read product backs in the fert section of whatever store you go to till you find one that fits as close as you can get to the ideal 20-5-14.

Here is an update picture i think they are getting worse by the day the yellow is moving down the plant. i think it might be sulfer deficiency what do ye think