The Clusia sprout always needs to be with his roots in the water, but be careful that the plants/leave do not get under water (only the roots).
When the plant gets too big for the tube, you can easily trim it with regular scissors.
You can also plant the Clusia in a pot with regular potting soil, the tube can then be used to make new sprouts.
The Clusia loves sunlight but they don’t need it to survive.
The best temperature is between 15-25 degrees.