Small yellow/brown spots on 1 plant

[Herm]

1. Soil
2. N/A
3. No ferts yet, 2/3 ocean forest 1/3 promix
4. T5's on 24 hours moved yesterday to 1k watt metal halide
5. Have been watering with 6.4 ph water only
6. 3 weeks old
7. Temp is about 75 humidity is about 50 percent
8. The grow area should have plenty of ventilation
9. N/A
10. 24 hour light right now

Here are a couple pictures

 

[leafminer]

Try some cal-mag, that will help, I think.

 

[Herm]

Okay I got my cal-mag. It says use 1 tsp per gallon of water is that a good guideline?

Thanks in advance.

 

[UKgirl420]

yes ^^^^

 

[smokybear]

Try the cal-mag and keep an eye on it. As long as the plant continues to grow and that doesn't spread or anything, they should be just fine. They are pretty tough plants. Keep us posted. Take care and be safe.