For my school science project i am test how fish(its winter so the only fish i can get my hands on are tilapia in the ag room) react to colors. I was going to put and individual fish into a tank and then have 4 identical types of flies in 4 different colors (red, chartruese, brown, creme) in the tank with it then time their reaction. Then i will add sediment to make the water have low visibility and see what happens. Using a different fly each time.

What fly should i use and do any of you have any suggestions.

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The way to a flyfisherman's heart is through his fly