Yellow / Orange spots

Looking at your photos it is tough to tell. I initially thought maybe under-watering on that small side of your container, but I am not too sure now. The green looks great, the leaves are thick, they do look a little odd on the edges of the developing leaves tips, but other than that, no issues I can see. Sometimes if you water and then immediately put a bright light on your plants you can cause burn spots. Your spots look almost like this and your light you use has a major heat sink on it, this could be an issue if you put the light too close to your leaves when there is water spots on them still. Hmm, really odd, as this is not showing clear nutrient issues, looks more of simple drying/burning in small spots. Cheers

Thank you. The pH is always around 6.2-6.3 @ernesttwwg. I will have to see if I can find that in my country! The soil which I use is BioBizz Light Mix. Thanky ou. The leaves look leathery green, it is because of the LED lightning @GrowingGrannie. I have another picture up on my diary of all the plants. I have to see where I can find calcium. The soil which I use is BioBizz Light Mix.

I'm going to have to say that it looks like either a potassium deficiency or your pH is off. Both show similar symptoms like burnt tips and brown spots on leaves. Test your soil pH and water pH. If those are fine(6.0-6.7), give it some langbeinite. I hope this helps.