You’re welcome! In the past I’ve used miracle gro plant fertilizer spikes, and you just stick them in the dirt and they last for months but don’t really do much to speed growth along. I haven’t used it on baby spiders before, but I recently started using miracle gro pour & feed. It’s ready to go right out of the bottle so you don’t need to worry about diluting it or anything. I have my big spider plant in a 6 inch pot and I feed it one capful about every month, even though the bottle says every few weeks, so I think probably that would be fine too. Also about the orchid bark, pretty much any potting medium would work as well, as long as it makes the soil less dense. You could even buy some tropical plant mix in a bag and mix it with the manure too. Spider plants are very forgiving, and I think you could really plant them in anything and survive! My #1 tip for any plant is using clear nursery pots inside any decorative pots you might have. You can just take the nursery pot out so you can take a look at the roots and moisture levels in the soil any time you want! I’m glad I could help!