Dendrobium Seedlings just not growing

[greyblackfish]

Hi dendrobium growers,

I've got 3 dendrobium phalaenopsis seedlings that I've had for 2 months. My other seedlings (oncidiums, cattleya, phalaenopsis) are growing like crazy in these hot summer months, my dens aren't growing at all. They get a lot of light in the morning and evening and in mid day they get a weaker grow light.

The little bulbous one is the New Hope Mini which isn't growing but doesn't have any bad history in these two months. I've kept them in sphagnum moss and keep them hydrated. They just don't grow.

The other two have been kind of the experiment ones. They started out in bark mix combined with a bit of moss. They wouldn't stay hydrated at all and I have recently repotted them in all moss. The sad one with the single leaf arrived with a pretty cane but the cane and leaves dried up very quickly and I cut it off. Yes I know that I'm not supposed to cut off canes but I was worried about disease and it was dried up. Anyway the surviving cane has hung on. When I repotted, I saw no growth at all.

Are they simply in dormant stage even when it's growing time? Please help