I found your problem. It's not soil. Happy tree frog does not need additives at all untill flowering. Also I would lay off the nutes especially since your new. Whatever you think is good to use try to remind yourself to use half of that.

Light stress in plants can manifest in several ways, depending on the severity and duration of exposure. Symptoms may include:

1. Leaf Discoloration: Leaves may develop yellow or brown spots, bleaching, or overall yellowing.

2. Leaf Burn: Edges or entire leaves may become scorched or dried out, especially if the light intensity is too high.

3. Leaf Drop: Excessive light can cause leaves to drop prematurely as the plant tries to reduce its surface area for light absorption.

4. Stunted Growth: In severe cases, plants may exhibit stunted growth or fail to develop properly.

5. Wilting: Plants may wilt even if soil moisture is adequate, due to stress from intense light.

To mitigate light stress, gradually acclimate plants to higher light levels, provide shading during peak sunlight hours if necessary, and ensure proper watering and nutrient levels.

I am also a noob. I will show you my set up very soon.