All my month old plants are dying

I have month old plants with at least 4 sets of leaves each. My plants are all dying from the bottom up. They are turning yellowish with dark blotches not touching the outside of the leaves. I'm using light warrior. could it be i need to transplant to the super soil? any help is greatly appreciated. I was also wondering my plants had the same problem during flowering though last time. could that have been that the nutrients in the soil ran out? I have no idea what to do i'm just frustrated looking at all my plants dying.

Got a pic hard to tell from just a description.

pics ma man,, we need pics!!!!

ok hold up i will post them.

They look hungry and a bit small for a month. transplant them and give them a half dose of fertilizer.

That soil may be compact too. Get some perlite into that soil to help the root system develop for better plant growth.

Most likely not enough food (nitrogen) to keep the bottom leaves healthy. There is only so much food in a cups worth of soil. They need a light feeding because to much food in that cup will kill them.

I'd suggest you transplant them to a larger size with a very light feed.

I agree! Repot those suckers into at least 3 gallons, and add at least 25% perlite. What kind of soil are you using?

Well i was scared with the marks i saw on the plants so early. Thanks for the input and help. I usually transplant them into 5 gallon buckets right after the roots come out of the jiffy pots i think their called. last time my plants grew to the ceiling because all i have right now is a 400w hps light and the 3 plants i had stretched to almost 7 feet tall. I purposely did that this time to limit space. is that ok to do? I am also vegging them under a 150w cfl blue spectrum light this time. I am using light warrior soil now. I made subcools super soil not knowing there was a revised version so i'm finishing that up now since i have a tremendous amount of it. From the quality of the last grow, i definitely am a fan of super soil. I put that on the bottom third, mix the base soil and that together in the middle, and the the top is 2 parts ocean forest to 1 part light warrior. Does that sound ok?