Get the RH up in there and lift the pots off the ground so they can drain freely when you water.
Never water with just water (always food and calmag if needed), never let it go dry.If you are around much, multiple small feedings per day will get you fastest results.
If you need things more flexible, you can do the like soil way, where you let it dry out a bit in between waterings.If your pot is light after two days, you have the amount of water correct(for the time being)