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@Bubba_green, When the leaves curl up like that it means the light intensity is too strong. In your case the bottom leaves are fine so it means the top of canopy is to close to the light.
You need to take care of this quickly because it will continue to affect your over all yield and most importantly quality.
Another sign of too much light or too close is when tip of the leaves point upwards or curl up while the bottom of the plant is fine, most people confuse the first signs for a lack of nitrogen but in reality is due to light being to close or to strong..
Stage 1 The tip of the leaves point up or curl up
Stage 2 Top leaves turn pale
Stage 3 then turn yellow
Stage 4 Leaves curl up and then crisp up
