Its not necessary for the roots of those type of plants to reach into the substrate, their roots are designed to take in nutrients ditectly from the water column (some of the longer roots may eventually grow into the soil to get nutrients from there too and thats okay).
After the roots have grown around the rock, you can remove the string and the plant will grip securely onto the rock on its own.
In nature such plants specialize in anchoring themselves to rocks and wood with their strong root structure.
Thanks alot! Great information indeed!
Bro Urban Aquaria, I like your creative idea of using marimo ball to make a carpet...going to try it. Do they need soil or is sand ok? Will they spread/grow if plant on solil? I was looking for sand substrate to partially fill up my tank. Went to Nature and a shop in Toa Payoh as well as seletar farmway but only one brand (think it's east ocean). 5 kg for $15. I thought sand will be much cheaper than soil but apparently. Any other shops that sell sudo sand etc which any of you can recommend? Thanks.
Marimo ball doesn't need any substrate to grow, they can be placed in a bare bottom tank too... it's actually cleaner that way as soil and sand tend to stick to it.
For sand you can check at places like C328, Seaview or East Ocean. They carry a range of different types and colors of sand, lots of choice.
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