OK, guys, here are a cross-section of what I have. These plants are anywhere from 4" up to 8" tall. Most are single-trunked but several have two branches and one has three branches. These were all germinated over a 7 day period, the first week of June. Some have skinny trunks and some have fat trunk. These are all in the solarium and get lots of natural light.
Sixteen out of 19 are in 3" or 4" clay pots. The leaves seem to still be actively growing but some of them are sort of "beat-up". I found out that these adenium don't seem to care for my insect mix. I sprayed some on a plumeria adjacent/over the adenium, and the mix dripped onto the adenium leaves. I also found out that adenium leaves don't seem to like to be touched by other plants. The leaves of that plumeria and a couple of fiddle leaf ficus plants touched some of the adenium leaves. The adenium leaves that were touching other leaves seem to have developed those brown spots. The spots could have been caused by something else as well, or a combination of things. I don't know.
@RickCanada and
@Ursula, and others, tell me about elevating some of these plants. I had a doctor's appointment today and that messed up my timing to re-pot these adenium. I plan to do so tomorrow, re-potting them all into 4" air-cone, plastic pots.