I'm having the same problem. I know its not a root problem though because they are in very large pots and the plant itself is only three inches. My plant is both outdoors and indoors. I usually bring it in every other day to keep it under my LED ufo but other than that it's mostly outside. It's been raining a lot here so it has been getting a lot of water and I thought that might be the problem. But I let it dry out and the plants don't look any better. One of my leafs was shriveled, yellow, and brown so I trimmed it hoping the plant would focus it's energy on growing new healthy growth but my leaves are shriveling. They are still dark green but they look like I dehydrated them :/ I use only bottle water to feed the plants with a 1/4 strength general hydroponics micro and grow with also a 1/4 solution of maxi grow. I don't ever test my ph because I figured that bottled water is already at a good ph level. I don't really have enough money for ph up or down right now. So the ph could be what the problem is but I don't know.

What is liquid light? I've never heard of that.