Dino ID

[KimG]

Dear all
I come back to ask for more help.
My long battle against Dinos continues.
It finally seems to be going somewhere (very high doses of hydrogen peroxide).
But while overall things seem to be better, I still have the algae on the video below in the sand bed. Can someone identify them?
After the peroxide treatment I still have DinoX at hand to give it a shoot.


PS: UVs have been running for months, nutrients are up, lights are down, black out with UV and peroxide tried as well.

Thank you all for the help

 

[KimG]

@taricha
Sorry to bother you again. Any idea what it could be?
Thanks

 

[taricha]

these are prorocentrum dinos.
They are quite stubborn about wanting to stay on the sand. They do go into the water and are affected by UV but it often takes a lot of encouragement.