Christmas cactus thrive in our hydroponic system! They're much stronger and more durable than growing in soil.
It might take a couple of weeks for your plant to adapt to it's new home however.
Being stingy with the water for the first couple of weeks is the key. Then, gradually move to a definite wet/dry cycle similar to what the plant would experience in its natural growing environment.
For the first 3-4 weeks:
Using the water gauge as a handle, lift plant from outer pot and take to sink. Pour KLN Rooting Solution through the pebbles at the sink (1 TBLS KLN per quart of water - clear water will work too). Return plant to outer pot with no standing water at the base.
Repeat once a week.
Moving to a wet/dry cycle:
After 3-4 weeks start using water gauge. Pour KLN Rooting Solution (or clear water) over pebbles until red indicators moves - then stop!
Wait until system is completley dry before rewatering. (use water gauge as a handle, lift inner pot to check for dryness).
Rewater when bottom of pot is dry.
After a couple of weeks, go ahead and increase the water to 1/4 on gauge. Rewater when bottom of grow pot is dry. Plant should use up all its water in 2 weeks or less.
Dump out any water left over in pot after 2 weeks and force a dry period of several days before rewatering.
Increase water to 1/2 on gauge. Healthy plants should use up all the water in 2 weeks.
For best results I use KLN Rooting Solution in the water for the first 3-4 weeks - then I switch to Dyna-Gro 7-9-5 Grow formula.