My plant has some kind of deficiency.

I am using Dyna-Gro Grow (7-9-5) plant nutrients with tap water.
Any feedback would be appreciated. How can I save these before they get worse? Should I flush them?

I would add some cal/mag supplement in your next feeding.

Well i'm thinking that the calcium and magnesium the Gyna-Gro nutrients have in them are getting locked out due to an incorrect ph balance in the soil. If I correct the ph of the water im using will the plant start absorbing all the nutrients? Because this stuff has both calcium (2%) and magnesium(0.5%) so I don't know how it would have those deficiencies.

Yes - balance the pH of your tap water and you shouldn't have nute lock issues going forward.

Would walmart have what I need to balance the ph to 6.5-7 for around say 20 dollars? I'm asking because this needs to be addressed as soon as possible.

Any garden center or aquarium store will have pH test kits and pH up & down. Manual pH testers are pretty cheap, but the digital pens can be expensive. Buy whatever your budget allows, but the cheap options shouldn't total more that $20-30.

I don't live in the States, so I don't know if Walmart specifically will have it. Walmart has everything though, no?

I think Lowe's and Homedepot have something you can test your P.H. with, strips,meter good luck

Wal-Mart had test strips and big bottles of POWDERED ph up and down for pools and spa's. I will check out lowes next. I did not buy the powdered kind because the measurements on it was for a minimum of 200 gallons lol.

forget about ph, here's something else.

soil looks really wet, how often do you water? Are you reusing soil or this is a new one? How much do you feed them? If soil is fresh I doubt that you would already have ca mg def. If ferting too much like too much of P, can cause a lock out of cal. If possible better use dynagro foliage pro, 3-1-2 is what you need throughout the grow with some camg supplement at a second week of flowering.

using Miracle Gro organic choice. I water with 1/4 nutrients every watering. and I water them every 2-3 days.

Is there at least a day or so where your soil is decently dry? If your soil never dries your roots won't grow so well. Also it's very easy to get nutrient burn/lock from Miracle grow. It has time released nutes. Generally it's just not a good soil.

Might consider Of or fox farms-hapy frog? and some perlite?

It's just my thought, but a few grows ago i had a plant that came down with Nitrogen defeciancy from Miracle grow and never recovered. Mayhaps we see early yellowing of n def?

Are you letting the tap water sit for 24 hours before using it? Chlorine burns.....ouch....