Hey pep, I was just reading your grow log man, you are doing pretty well on the budget your running. I did notice though that you asked if the discoloration was in any way normal, it is not. It looks to me like you may need to invest in a better soil right away. The lower leaves are showing sign that you may have a nitrogen problem since that is where the leaves do not look good, and the color is not right. You might also have a calcium issue but that is debatable.
There is no question now though that you need to spend a little now to keep your babies in good health if you want them to get big and strong, you will need a better medium for them to grow in.
I recommend using Fox Farms Organic Ocean Forest mix, it is relatively inexpensive if you buy it online ( I got mine on Amazon ) for roughly $8.95 for a bag. And it will last throughout your entire grow. I do NOT recommend Miracle Grow, for roses it's one thing, for this it is just too much and it will burn your plants horribly.
If online is not an option for you, check out your local nusery for organic soil mixes, look at their plants, are they flourishing, do they use perlite, make sure you look for these characteristics when choosing soil from local nursey's, if the people have all of their plants in good health, chances are you will too by using whatever they use. Which I can guarantee you, will not be miracle grow.
But nonetheless, get them a better medium right away, waiting too long and it might become too late. After transplanting, you will see signs within a week or so that they are doing alot better with alot of new growth, the areas already affected by nutrient loss look like they are done for, at the very bottom, you can still save what you have though so get your ass looking for new soil before its too late :p
I have confidence that you'll do just fine :thumbsup: