Fan leafs.

The deep green coloration of your plants suggests they may be experiencing nitrogen toxicity. When plants absorb more nitrogen than they need, their leaves tend to take on a darker shade of green, which can eventually lead to other issues such as slowed growth or leaf deformities. To address this, consider slightly reducing your nutrient concentration, particularly the nitrogen-heavy components, to prevent further buildup. Additionally, the slight curling at the tips of the leaves could be an early sign of light stress. When plants receive too much light, they may attempt to protect themselves by curling their leaves upwards or inwards. This response helps reduce the surface area exposed to intense light. If this continues, it can lead to bleaching or further stress on the plant. You might want to raise your grow light slightly or decrease its intensity to see if the plants respond positively. Keeping an eye on these signs now can prevent more significant issues down the line.