Help! Newbie caring for seedling.

[2SadDeadPhals]

Hi! So the newbie I am, I accidentally ended up with 2 very young plants. I tried to look for care information on internet, but most I could find was that young plants require more water.

Any additional tips would be very appreciated!

1. Very young Tolumnia. Came in tiny basket bare rooted. I potted up in bark and sphag. Put a half amount of slow release fertilizer. One baby leaf died off since I got it, but there is new growth that is getting bigger.

2. Very young Oncidium. Came bare rooted. I potted up in sphagnum moss. Bottom leaf dried up, and some of the other leaves are curling a bit inwards. Not sure if its normal? Maybe my humidity is too low?

Thank you in advance for your help! I am attaching photos. They are both very small.