Good Morning, I got ambitious and bought this Dendrobium Regina seedling. It came bareroot and I potted in a seedling mix of fine bark/lava rock & a tiny bit of sphagnum moss on top. It has only been in the mix 5 days and now the leaves are all yellowing from the base/tip and the roots (which were initially firm) are now getting soft. Some of the leaves are getting these spots which appear sunken. Is this a fungal problem? (I barely water it; allowing for drying in between.) Thanks in advance for any advice.