The media in these two cribs is coco coir peat. I made shallow indentations on the surface, placed the seeds in them and sprinkled a miniscule amount of perlite over the seeds.
Note: I planted two different varieties, hence the difference in size.
I had watched a video where seeds (not adenium) were planted in coco coir and the same kind of seeds were planted in another container filled with potting soil. After a few weeks the seedlings were pulled out and compared. The seedlings planted in potting soil had nice lush growth topside...the ones in coir were not lush, but the roots were bigger than the others.
Referring to my experiment and photo above...at this stage I can see that the top growth of leaves is closely stacked. I have not used any fertilizer on these, but soon I will fertilizer with micro-nutrients only...no NPK. I'll post again about this experiment in a few weeks.