I can't figure out what is the problem! Need help

Hello to everyone, I'm a first time grower. I'm actually trying to grow a White Widow auto from RQS, she is 18 days old and since 3 day ago she started having some problems. She stays in a 9 liter pot filled with biobizz light mix, I let her in my balcony and she gets 8-10 hours of direct sunlight. 3 days ago i started noticing some yellow dots that at first glance resembled very much a spidermite infestation, so I decided to spray with some neel oim solution. Today the situation is worst, the yellow dots are starting to become brown spots and some tips of the leaves are starting to show black spots, so I started to think that this could be a nutrients deficiency, a calcium deficiency to be specific. The first image is when the yellow dots started to show, the other are the current situation of the plant, any help is appreciated, thanks to everyone!

Your cannabis plant show signs of a calcium deficiency...the pH at the roots is too high or too low. That is because when the pH of your root zone is off, your cannabis cannot properly absorb calcium through its roots. Therefore the first step is to ensure that you have the correct pH for your growth medium.

BenGman said:

Your cannabis plant show signs of a calcium deficiency...the pH at the roots is too high or too low. That is because when the pH of your root zone is off, your cannabis cannot properly absorb calcium through its roots. Therefore the first step is to ensure that you have the correct pH for your growth medium.

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I've always ph'ed my water between 6.5-6.7 before watering. Anyway I was thinking to flush the soil tomorrow, is it a right choice? When I flush is important to ph the water? Thanks man for the answer

Perhaps it's going above 7 quickly I'd let the water sit for afew hours or up to 24 hours to let the unwanted chems evaporate and stable the ph more before adding nutrients...In soil, calcium is best absorbed by the roots in the 6.2 - 7.0 pH range, flush your system with clean, pH'd water that contains a regular dose of cannabis-friendly nutrients that includes calcium. This will remove any nutrient salts that may be affected the uptake of calcium and help restore pH to the proper levels , also check your run off.

welcome mate, just trying to help

Hi eilgom,
Is that biobizz light mix even a soil? It's advertised as a "substrate" which needs nutrient supplementation from the beginning. Sort of like coco. It also advertises that it is ph buffered...well hell this is what it says:

• While its organic elements are impossible to measure, they do have a self-regulating system, which helps maintain the pH values at the correct level.

So are you using this stuff correctly?
JD

get ya a tsp of epsom salt in a gallon of water mixed well give it 20 minutes or so to dissolve fill you a sprayer with it and foliar feed them some. spray all the leaves i also dont think they are getting enough light, should be trying for at least 16hrs a day. and has John Dee said im wondering if your soil is the problem not familiar with biobizz but your plants look hungry for not only some N but some trace minerals as well.

get some cal-mag and dose em the, "seedling" dose