In the water if things are done well it is always faster, including the first parts of life. obviously it takes more "tact" and attention to detail.
- MAINTENANCE of a stable PH
- start with the right solution 600-900ms / cm
- allow the rockwall to dry just right before wetting again.
If things are done well and precise there is no comparison with earth.
Oxygen always available, nuts also and adjustable to the second, same ph, same temperature of the water. Why should it go "slower"?.