Dinoflagellates and low nutrients

[Crimson]

The added pictures of the sand bed looks like cyano. Chemiclean will work, but use caution.

 

[lReef lKeeper]

The added pictures of the sand bed looks like cyano. Chemiclean will work.

That's after treating the dinos ... I'm not seeing the bubbles anymore.

 

[Crimson]

Because the dino's are gone, cyano took its place. It happens a lot! Look at rev for example of what hes going though here: https://www.reef2reef.com/threads/life-after-dino-algae-do-i-nuke-the-cyano.421494/