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Your results might be a little too similar and subjective, in my opinion. For the sake of a 4th grade science experiment, maybe doing something that you know is going to cause a big difference but, the average person will think is pretty cool would be a good idea. For example, use the shrimp in one container and artificial fertilizer in another or, create one container that will grow more algae than the other and see how the shrimps do in comparison. Maybe these aren't good examples but, I'm just saying something with a little more contrast that isn't too obvious might be more interesting to the audience in question. As a breed, I think us aquarium folks are much more in tune to differences in water conditions than most people. Best of luck with your experiment. We expect an A+.
