Yellowing on some leaves - Unsure what the problem is

[wmttt]

What Strain is it?
grape ape
Is it Indica, Sativa or Hybrid?
indica dominant hybrid 80/20 I believe
What percentages?
How Many Plants?
1 plant
Is it in Vegetative or Flowering Stage?
vegetative 3rd week. transplanted 3 times.
Indoor or Outdoor?
Indoor
Soil or Hydro?
Soil
If Soil... What is in your Mix?
Fox Farms Ocean Forest
If Soil... What Size Pot?
5 gallon
Size (Wattage) of Light? How Many?
300 watt MARS LEDS (150 true watts)
Is it Air Cooled?
4 inch inline exhaust, 1 intake fan.
Temperature of Room/Cabinet?
72-74 F
RH of Room/Cabinet?
50%
PH of Medium or Reservoir? between 6 and 7 using two different brands of ph strips
Any Pests?
none
How Often are you Watering?
was watering every 3 days
Type and Strength of Fertilizers used?
Used grow big once, seemed to burn plants. Flushed after with 1 gallon no nutes.
No ferts since
Size or Square Footage of Room?
2x2x4ft
alright so i have been having issues with this plant from early on...
Initially i gave it some grow big. seemed to burn the plant so i flushed.
later had some signs of cal deficiency i gave it some cal mag.
Didnt realize this was cal mag and nitrogen burnt plant
did a flush with no nutes. and have watered every 3 days when dirt is about a lunch dry with calmag (no nitrogen this time)
this was about a week and a half ago
i just transplanted into a 5 gallon pot about 5 days ago.

This is where we are at. Yellowing on some newer leaves I am thinking nitrogen deficency because of all the flushing that i did without nutes..
i am unsure of what to do at this point any advice would be great.
should i just scrap this?
This is my second time growing but the first time was so effortless and easy compared to this. I have been phing my run off and water used for watering since day one. When i transplanted i added some dolimte lime

 

[Emilya Green]

I believe that you are watering way too often and not letting the plants dry out ALL THE WAY TO THE BOTTOM, every time.

That explains the lack of lift to the leaves, but not the colorations. The discoloration in the top growth is clearly showing that you have a non-mobile nutrient deficiency...and it looks bad. Here is why.

You already are not watering at the correct pH for Ocean Forest soil. You must adjust every fluid coming into that soil to 6.3 pH, every time. Not 6-7.... 6.3... every time. You made the choice to go with synthetic nutes, so now pH is critical. Find a means to get more exact with your pH measurement, or figure out where in that color chart 6.3 is... you are adjust way too high and out of the usable range for your plants. To compound that problem, you added dolomite lime.... and this buffering agent is now going to make your soil drift upwards in pH from the moment you water. If you don't adjust to the low side, you are already out of the usable range and then it drifts even further out of range... no wonder you are having problems.

 

[Major PITA]

Three weeks old and transplanted three times???
IMO, too much water and too much "stuff" has been added to the soil. I add no fert's to plants until they are about three weeks old. They don't need it. The seeds have all they need and your soil has nute's in it already. Also, three days is nowhere near long enough for a plant that size to dry out if it was watered correctly.

For future reference: Put seed in soil. Water well. Leave it alone.