alright ....no sign of spider mites ....maybe one more sprays should do it .... then no further spraying of anything unless something pops up ....
brown leaf tips is either: over-watering or under-watering ....
have to be your own judge to figure out which one it is .......
yellowing leaves is often the same as brown leaf tips
with adenium....temperature plays a huge role on when and how much to water ...as temperatures climb, plants need more water - as temperatures drop, plants need less water .....
ask yourself "when was the last time plant was watered" ? ... and "how much was it watered" ?
sometimes ...lifting the pot can indicate how much moisture remains in the pot ....a wet pot will be considerably heavier, whereas a dry pot will weigh considerably less (have to know your plants for this to work)
try the "finger test" ...poke a finger down in the soil .... does your finger feel moist ?.... or does your finger feel dry ?
(a rocky, chunky mix wont let this happen)
if moist = hold off watering ....if dry = water
oh yeah ....just my opinion ....make plans soon to transplant seedlings into their own pots ....