My son has to do a project in school..making an ecosystem...after some research he decided to build a habitat for mealworms. Is it truly as easy as adding pet store bough meal worms to bran, an adding a cut up, apple, potatoe or such on top and then just let them be(replacing the bran and veg/fruit occasionaly). Also I've read you can use, chick starter, bran or rolled oats..does one work better than the other? Any advice? How many should we put in a 5 gallon aquarium? How deep should we put the feed?