An anonymous donor has given a class $200 to buy an aquarium for the classroom. The class has been divided into groups, with each group tasked to research aquarium options and make a proposal for the size of tank, accessories, and fish that fits within the budget. Factors to consider include following the 1-inch per gallon rule for fish size, accounting for necessary equipment like filters and lights versus decorative items, and paying close attention to costs as prices vary by item size.