Sick Plants Please HELP. Picture(s)

I have several leaves that are beginning to show signs of what I think may be a potassium deficiency. The problem is only showing up on the bottom set of leaves on maybe 4 of the plants. I had been using a fairly low concentration of nutrients with every watering. The last time I watered I decided to give them just water which is why I think they are showing deficiency signs. The pots are still too wet to water again to feed them the nutes. Anyone agree that it is a potassium deficiency or do I perhaps have another problem on my hands?

Could be. Check the pics in this link: http://www.icmag.com/ic/showthread.php?t=11688

from the link he gave u might have the following
Manganese deficiency
calcium deficiencies
Potassium deficiency

but ur plant looks more like it has Manganese deficiency

Thanks for the great link. Yeah judging by that it looks like it could be a slight mixture of Phosphorous and Manganese def. I'll do my best to correct that ASAP.