DutchmenSport wrote:
Algie won't hurt you. If it won't hurt fish, it will not hurt you either. Just think of the algie as a new green vegetable.
"Many types of algae are not only edible, but they may also provide health benefits. Scientific studies show that compounds in algae have improved certain health conditions. Consult with your doctor before trying to prevent, treat or cure any condition with algae."
https://www.livestrong.com/article/430446-can-i-eat-algae/
The green algae is fine but it's metabolic waste products can be unpleasant, and cause gastric upset.
Some algae species also emit toxins as a defense to kill competing plant species. Again not dangerous to humans but can give you digestive problems, or if your health is questionable already perhaps more severe complications.
Blue-green algae on the other hand is actually cyanobacteria and not a plant at all. It produces a wide array of toxins including neurotoxin, which are harmful to humans and other higher life forms.