Trouble with Petiolatum seedling (oxyglossum)

[Jeff9]

I will post here the question i posed to Ron Hanko which owns alot of Oxyglossums if i am correct, hopefully someone can give me some information.

I've been growing a mature laevifolium (obviously easier) with succes for a while now, and a while back added a violaceum seedling, which seems to be doing fine (it is not doing anything yet tough), i heard they are temperature tolerant tough.

I recently added Dendrobium Petiolatum, i was at a friend's greenhouse and he had a few seedlings, they were in pretty bad shape, barely any roots, and the leaves appear leathery and dried.
He offered them to me for half the price so i thought i'd give it a shot.

So as i got home, i got it mounted on a epiweb slab with some moss mix and sphag (this is how i grow all my plants, succesfully), and hung it under lights. I work all week so its hard to check during the week how things are going unless i turn the lights back on when im home (timer shuts off at 7pm, goes on 6am).

Alright, so the problem i'm facing, after checking the 2nd day after i got it, i noticed alot of the leaves started developing a few dark spots here and there, i immediately thought this was either water staying on the leaves at night or "sunburn", altough unlikely. i also noticed the mount was staying very wet in comparison to how it was being grown before, so i took it off and put it back with only one sphag strand now and hung it in a slightly drier, and less light place.

Every day i checked atleast 2-3 small STILL GREEN leaves would come off the plant. I know this can have alot of causes, temp, light, moisture, so what i am doing now is i will put it in a humid container in my basement every night where it is 14,5C and put it back under lights in the morning.
My eventual plan is to put a small tank for the cooler minis in there.

Some information about my setup;
tank 100cm wide, 80 cm tall, 50cm deep.
3 x 39watt lamps, mistking system with 6 nozzles going on 8 times a day.

daytime temperature 21C ~
night time ~ estimate 18 to 19 C ~

humidity 80%

Hopefully you can give me some information about this species,

thanks,
Jeff

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