Hairy Cyano like algae toxic?

[Myka]

Bummer. Yes those are dinoflagellates, and a bad case too. You will need to be diligent to get rid of them. Follow the advice of the above link I gave you. That's the best method I know. Transfer all your snails, conchs, and other gastropods to another tank. The dinos will kill them and add more fuel to the fire.