well, today one of the plants showed some signs of a problem. They all have the same soil, ph'd water, nutes, etc. Just one of the plants have some leaf curl (upwards), and the edges of the same leaves were turning a lighter green than the middle.

I tried researching, and seems like everyone has a different diagnosis. I pulled her out and flushed her with ph'd pure water. It's only a few leaves, but i am worried... hope she gets better.

If anyone KNOWS what it might be, let me know.