Subject: How to grow germs with a homemade incubator

WE ARE DOING A SCIENCE EXPERIMENT TESTING THE EFFECTIVENESS OF KILLING DIFFERENT GERMS WITH 
DIFFERENT CLEANERS.  WE HAVE CONSTRUCTED AN INCUBATOR USING A AQUARIUM WITH A HEATED 
BOTTOM COIL.  COVERING THE TOP WITH SARAN WRAP HAS HELPED TO GET THE TEMP UP TO APPROX 96 
DEGREES.  WE USED CHICKEN WIRE TO CREATE A PLATFORM TO REST THE PETRI DISHES.  SHOULD WE 
PLACE A PLATE OF WATER BENEATH TO CREATE A HUMID ATMOSPHERE.  WILL THIS METHOD WORK?

Re: How to grow germs with a homemade incubator