How to bulbos and gongora fair to S/H?

[estación seca]

The plant's roots need to reach the water. If there is water in your reservoir, the level of sufficiently-moist LECA depends on the distance from the top of your reservoir, rate of evaporation from the top and the wicking ability of your LECA. You could set up an S/H pot, keep it watered and then take it apart to see where is the level of moisture.

I think the plants might send roots deeper if they sense water down there.