Compare poluted water versus clean water in a lake /Creek etc

Students collect trash around a creek or lake We set up two Aquariums one with trash and one without and Comepare growth for 6 months. We merasure the amount of food feed to each tank, We also find the mass of all the fish and plants in each tank. We measure water quality such as disolved CO2 O2 Nitrite Nitrate Amonia Tonins such as PCBs etcWe also Decribe in detail how each tank changes. At the end of the time period we record the mass of growth in each tank etc and then evaluate the results. We put together a power point to show how poution changes an ecosystem.At the same time we would monitor the water in the creek to see how it compared to our lab tanks.