Quote Originally Posted by adr0510
Looks like you may have a manganese or pottasium defiency. Just need to add some greensand for manganese. For the pottasium use Earthjuice. If its not the acid problem then you may have a calicium defiency.
Have you ever grown before? Or were you just looking at the troubleshooting pictures?
This is a formal warning: If you don't know about the subject, don't try to pretend you do. This is not a game- our members are real, legal, medical users who have a limited plant count and depend upon their medicine. Following confidently-posted CRAP advice from n00bs could potentially KILL their plants and deprive them of this medicine.
By the way, the elements are spelled 'Potassium' and 'Calcium'.

Mushaboom, you are cloning into a hydroponic medium and should aim for a pH right at 6.0 for your RW cubes. Treat them [cubes not clones] before cloning to achieve this- soak in a 6.0 solution or a commercial RW conditioner, rinse with 6.0 pH'd tap water, squeeze out excess, and use.
You look like you have too much heat/light and not enough moisture, but without a reasonable pH you won't gain a lot from correcting that.

As for the older plant, I see scarring from Magnesium deficiency on the low leaves, and slight fertilizer burn on the upper ones. That spells lockout to me. You are running soilless, which means your pH should be dialled in around 6.2-6.5, and don't scoop out soil- you'll damage roots. You need to flush with tap water at pH 6.4 to bring your medium in range, and then feed with a COMPLETE fertilizer that contains micronutrients. Get on a regular feeding schedule too- not just whenever you remember to feed. This is important. Be consistent. Your upper leaves don't look bad actually, and I think that you may already have flushed out the worst salts that were in the soil, but you will need to be sure.
If I were you, I'd lose the LK and hydroguard for now, flush well, and do a light foliar feed with a micronutrient such as GH micro or Algoflash mixed up at half strength.