I just think the novelty of these type of displays was up in the 90s, It’s time for an upgrayedd. I propose leprechauns flying up and down the river wearing water jet packs, shooting people with their Chicago-style hot dog cannons would be more with the times. What’s your idea?
https://oceanservice.noaa.gov/hazards/hab/great-lakes.html
TL;DR: Algae would almost certainly be worse than whatever they are using.