Do you know what species of Sphagnum you have?
I've been growing some in different conditions for a few months now, and depending on their sub-genus they can be super easy or a real pain.
The Sphagnum sub-genus will retain moisture and will grow pretty seamlessly as a top-dressing, but the other ones require such a quantity of water that their heads might desiccate really fast.
It may work perfectly fine in LECA though, it's worth a try.
Two things worth noting :
- When grown without enough light for its taste, Sphagnum will get etiolated. Instead of having bushy carpets that retain humidity, you'll end up with weird looking sticks with a few twigs, and they'll be terrible at hydrating with capillary action.
- Sphagnum acts like a predatory moss and will drop the pH to 3-4 to kill concurrent plants. They release polyuronic acids, which, if I understand correctly, messes up with calcium carbonate and nutrient absorption.
I do not know how sensitive Bulbo are, maybe this is useless to you.
Most species can withstand (small) fertilisation, but as stated algae become a problem on the long run. And they develop within the Sphagnum's cells so you can't do much about that.
Best of luck!
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