Leaf problem, help needed. WORRIED( PICS)

Had this problem for about a week now on one of my plants. I have yellow spots on my bottom leaves they are also curling down slightly. The first set of fan leaves are starting to have the same problem. Looking at the leaves from the underside they are nearly like little holes.. Top leaves are showing no signs yet. Pic is of the top and bottom of the leaf.
Really worried this plant is growing best outta my three. Nutts are fox farm, thought it may be a a lack of nutrients, not sure though. Hydro system
NEED HELP

Difficult to tell from the pics but it doesn't look like a deficiency. My guess would be thrips. I have seen them but not dealt with them so I'm unable to guide you on a fix.