Help identifying Dinoflagellate

[DBo]

Hi guys,

struggling with dinos over the last couple of months, I’ve invested in a microscope but still unsure of species. For me, they look And behave like Amphidinum, but they seem to migrate into the water column at night. Also, my inverts have been dying recently which tells me it’s most likely toxic too.

video @ 1200x
Photo @ 600x

video isn’t great, but if anyone has experience with these and can tell me which species I have it would be appreciated !

 

[Beardo]

Not 100% sure but possibly prorocentrum

 

[taricha]

For me, they look And behave like Amphidinum, but they seem to migrate into the water column at night. Also, my inverts have been dying recently which tells me it’s most likely toxic too.

agree on amphidinium. Why do you say they go into the water at night? (the sand gets lighter even for types that don't go into water, because they go below the sand surface at night)

although many amphidinium are low/non toxic, some can be toxic.