Algae on the Soil

That's the best part : you dont ! algae is not a bad sign, it helps keep moisture in and stabilise the temperature, it will naturally disappear or not, either way it naturally produces nitrogen for the plant. using humic acid breaks it down, otherwise just scoop it out with a spoon . Hope this helps ! 🚀

Turn it into the soil, it cant grow without light as it is a plant after all. Also less water. Good Luck!

This is going to sound weird but it works ... Sprinkle a little cinnamon on the algae and surrounding soil. Cinnamon is a natural repellent and will help stop the spread and prevent it from blooming and absorbing all the nutes... Good luck!