As algae blooms become thicker, they can cause surfaces like your roof, sidewalk or driveway to become slippery. Without treatment, your driveway will be extra slick during the rainy season, making it dangerous to drive or even walk on. In addition to the risk of slip-and-fall accidents, algae growth is unhealthy. Gloeocapsa magma can have negative health effects, especially for individuals prone to allergy flare-ups. Algae particles give off airborne toxins around your property that can be harmful when inhaled, especially for a person who’s already sick. Contaminants from residue buildup may lead to vomiting, diarrhea, rash, eye irritation, cough, sore throat and headache within two hours of exposure.