Comparing different types of aquarium water filters
Our hypothesis has been proven to be correct - sponge aquarium filters are more effective than under-gravel filters.
Aquariums at least require a mechanical and a biological filtration system to keep the water inside the tank healthy and conducive for fish to live. The under-gravel filter and the sponge filter are able to perform both biological and mechanical filtration functions.
To improve the reliability and accuracy of our results, a larger sample of participants should be used.
This science fair project may be repeated, this time, with different types of filters like the power filter or canister filter.
Modify the science project experiment, using different types or different quantities of fish in each aquarium.
Selecting a filter - http://freshaquarium.about.com/cs/beginnerinfo/l/aa110998.htm
Aquarium filter and fish tank filtration - http://www.fishlore.com/Filtration.htm
Basic safety requirements