Dinoflagellates ... is there an end to this nightmare

[Delphinus]

Has anyone here had a dinoflagellate bloom in their tank, and lived to tell the tale?

I thought I've lived through the worst cyano blooms, but this is far worse. It clogs my powerheads, shuts down my calcium reactor, and clogs my overflow to the point that the tank ... well, almost overflows.

I thought I was having this because maybe my pH was too low, but pH is 8.3 during the day, dips down to 8.1 at night. That doesn't seem very low to me ... ?

What else can I look for?

NO3=0.0, PO4=0.1 ...