Expanding Foam and Substrate mix help :)

[Mentat]

This stuff? Richgro 5kg Palm And Fern Mega Booster Organic Fertiliser I/N 2961708 | Bunnings Warehouse Also any idea about that expanding foam?

That is a fertilizer for growing ferns and palms; not tree fern fiber which comes from crushed tropical giant ferns.

[Frogs1]

That is a fertilizer for growing ferns and palms; not tree fern fiber which comes from crushed tropical giant ferns.

I'm not to sure of you can get that in Australia, I could be wrong but I cant seem to find it anywhere. Can I go without this part or is it a must have part of the mix?