Things You'll Need
- Digital hygrometer
- Cellulose sponge
- Scissors
- 2-by-2-inch plastic sandwich bag
- Hole-puncher
Instructions
Check the humidity levels in your aquarium, using a digital hygrometer.
Cut a cellulose sponge to 2-by-1 inches, using scissors. Soak the sponge in water and squeeze it to remove half the water. The sponge should be moist but not wet.
Insert a hole-puncher into a plastic sandwich bag. Punch 10 holes on one side of the sandwich bag.
Put the cut sponge into the open sandwich bag. Press on the locking mechanism on top of the sandwich bag to close it.
Insert the plastic bag into the aquarium with the hole-side facing up. Remove and rewet the sponge as needed.