omygosh.. i just read your post very carefully (mammath) and i realize what my problem is.
Instead of JUSt dipping the bottom 1/4 of the RW cube into water when its dry... i also used an eye dropper thingy and dropped about a ml of water directly into the RW hole (directly onto stem) like once a day. DAMNIT!!!
And the irony is.. i only did that when i thought the plants were drying/curling/dying due to not enough water. For example the blueberry seedling i had that thinned out to a thread of a stem.. i would use the eyedropper on that thinking it was drying out on me LOL.
Its just plants are so complex to be honest. I've tore though plant deficiency websites or guides and i honestly thought mine were underwatered.. they were curling UPwards and the seedling cotyledons were crisping.
Is it possible that my plants ARE showing underwatered signs.. due to me overwatering it and screwing up the RW environment so much that its not able to absorb??
Sorry to hijack your journal Wiz but I'll just add one more comment about cloning.
It sounds like you may be doing a few things wrong there mate.
Underwatered or overwatered is hard to tell from so far away lol.
If your clones are showing nubs but won't grow roots is because they don't need to.
You keep dropping water in or around the nubs and they won't develop.
They don't need to.
This why you always water from the bottom to encourage the cutting to produce roots to chase the water.
Same goes for the seedlings.
They won't grow roots and develop if you keep soaking around the stem.
Not only that, your keeping the part of the cube that needs to be the driest, the most moist.
This will cause stem rot every time.
The top of the cube around the stem should never be wet.
Infact the top of the cube should be kept pretty dry.
I'm sure you will see improvement as soon as you stop watering from the top around the stem.