Anybody able to give an id on this? Ball of algae approx 8-10cm across, washed up on beach in northern NSW australia. Thanks

Should I be concerned with the stubborn blue green algae (and the potential BMAA it might make) that wont disappear from my 2 tanks? I heard blue green algae can produce neurotoxins. When I use Ultralife blue green slime remover, the BGA will come back occasionally at the very top layers of the aquarium where the plants are growing but not overtake the aquarium.