Potassium excess? Tip burn and yellowing on bottom leaves?
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I think that would help greatlyI don't think you have a serious problem. The new growth and the top of the plants look as they should. If they keeps getting worse you may need to look into a diagnosis.
If you don't want to wait it out and feel you need to take action; water with 0 ppm water at a pH of 6.0 ph to a good run off. Collect the runoff and measure the pH and ppm. Report back with the results along with more grow details (nutrients, water, tent, light, temperature etc. I'll help you figure out a plan.