Please Please help i don't have much time!

Okay so i have 5 female plants (not sure what the strain is), that are 4wks into flowering, and I've noticed some problems with the leaves. They are getting small yellow spots on the leaves, and the tips are starting to curl under. I checked for bugs, and didn't find any.. I use 5grams dry kool bloom for 5 gallons of water once a week and just plain water once a week as well. My Ph was at 8.0 so i read that we could use 1tsp lemon juice per gallon to lower my Ph, but i haven't noticed a change yet... I grow indoors but i have been moving them outside from 6:30am-6:30pm to get fresh sunlight.. also saves on electricity.. I don't know why they are looking like this, but this is my first grow, so any tips would help!!!!!

P.s.i also put sand in the soil due to knots

i meants due to knats****

When is the last time you fed?

Look to see if your nutrients has Sulfur (S) calcium (Ca) and magnesium (Mg) which are crucial for bud formation.

I am not really seeing anything due to over fert or deficient on the intense side.... Also check your nutrients for zinc (Zn) and Boron (B), Copper(Cu) basically check to see how much micro nutrients it has.

This can be a quick fix, im guessing your current nutrients needs to have supplemental micro nutrients.

These are the ingredients in my kool bloom.
Total Nitrogen--2.0%
Availiable Phosphate---45.0%
Soluble Potash---28.0%
Magnesium--1.0%
(Water soluble magnesium)
Sulfur--1.5%
(1.5% Combined sulfur

is there any natural way to increase calcium? or should i just buy something for it?
could the Ph being at 8 have anything to do with it? and is it better to use lemon juice/vinegar or just buy Ph-down?

we fed earlier this afternoon 5grams dry kool bloom with 5 gal water && also added 5tsp lemon juice with the 5 gallons of water

Ca deficiency can be fixed by adding garden or dolo lime (also the dolo lime helps stabilize Ph over time) there is also liquid lime, I never used it but everything added as liquid form is adsorbed alot faster.

Also what does the bag recommend for feedings? Is that 5 gram to 5 gal normal? Next time try to increase it to say 6 gram or even 7 and see how it works, but first add the lime. remember Dolo lime takes a while to work, that also contains Mg too, So try to find some hydrated lime and add 1 tsp per a gallon, that will give it the fastest absorption

about the PH
I recommend balancing the ph before you add anything. Get a meter , they run for the high end of 20 bucks. get a bottle of ph down or up, what ever you need and balance ph before you water or add nutrients, also check it again after you add nutirnets and adjust if it needs it...With ph being at that high of a level then yes it can effect the way the plant absorbs nutrient, you can keep adding the lemon juice if ya want, but if you dont have a meter you can be making it too acidic . For cannabis they absorb nutrients well between the levels of ph at 5.8-6.5 in soil

ok thanks ill try that!

If this does not fix it or if things get worse, send me a message and we can try to talk in real time to assess and fix your situation as best I can.

Also, I forgot to add that a gradual change in ph is better than flushing with ph'd water. An instant change like that to the ph with an already sick plant could end badly. Although, you are into flowering pretty far and you should be ok by getting the PH down to 7 immediately with a flush.

LOL, not ph-up, sorry, ph-down. Had ph-down on the brain from my pool