How to induce growth on Cattleya aclandiae seedlings

[EMos]

I have acquired a flask of C. aclandiae seedlings early last year and I de-flasked it only two months ago as the seedlings looked very small when the flask arrived. After two months I haven't noticed any growth on the seedlings either in terms of roots or leaves.

Picture of flask before de-flasking


I have planted the seedlings into a ‘compot’ with a mix of equal parts charcoal, pine bark, and polystyrene. Since then I have lost a few seedlings and the remaining ones are not showing any signs of growth. It’s summer here in Melbourne but temperature has been very mild, ranging from 20 – 25 degrees(70-75F) during day time. The compot is inside with my other orchids on the window sill, and I spray it thoroughly every couple of days and leave the mix to dry a bit before spaying again. I use a mild liquid fertilizer on alternate spraying.

It’s my first experience with cattleya seedlings from flask and I would like to have some advice on how to induce growth on the seedlings. I would also like to know if anyone has grown C.aclandiae from flask before and whether there is any particularity with growing this cattleya species.

The first picture is of the compot after de-flasking two months ago, the second picture is the compot after two months.


Thanks for your comments and suggestions
Eric