Species Seedlings - mature - growth conditions

[OzPhal]

Hi everybody,

Yet more questions from me!

I've got several 'mature-ish' species seedlings with leaf spans of around 9cms. I purchased them recently and they arrived packed in sphagnum moss. I've potted them up in Spaghnum moss and, for the time being, they're in a propagating tray with some recently deflasked seedlings... conditions are about 23oC and high humidity (don't have a hygrometer to accurately measure RH yet). My goal is to encourage growth so i have really strong plants... will those conditions be ok for that? The plants i have in there are:

P. tetraspis
P. venosa
P. violacea 'Blue'

and i have a hybrid P. Yu Pin Pearl

I'll soon be adding similar sized seedlings of:

P. bellina
P. violacea 'Alba'
P. pulchra
P. sumatrana
P. sanderiana
P. speciosa 'Alba'

to the above conditions too - again with the view of promoting growth