This is an idea for a display case or bulletin board using the ocean theme. "Edison is a 'School' of Positive Learners." Change the words for your use, keeping the "school of fish" theme. Use blue paper or a table cloth as a background. Allow enough paper for an ocean floor as well. Cut out fish clipart or use stuffed animals and cluster some of them into schools of fish. If you are able, use fishing line to hang fish from the top of the display case. Add a couple fishing poles, rocks and plants to help create depth. Don't forget to add seaweed by either cutting it out of paper, using fake plants, or mixing the two.
"Edison is a school of positive behaviors" (Write some behaviors on the fish)
"Edison is a school of wonderful students" (Post pics of students or classes in the background)
"Edison is a school of successful students" (Post pics of students who have earned awards, etc.)