Prorocentrum Advice

[blkhawk10]

I have been battling these for a couple weeks now. I did a 48 hour blackout with UV a couple days ago and it seems like I wiped out 70% of them. I have been adding the light back slowly and now I'm only running blues. There is still a couple spots that have dino's on the sand. I have dosed silicates and been able to maintain readable levels of nitrate and phosphate. My question is should I hit the tank with another 48 hour blackout to get rid of the rest of the dino's or just maintain the course I'm on and hope the bloom is over?

 

[taricha]

If it were me, I'd vacuum out the parts that look brown, let it ride for a little while - until I was comfortable that the corals wouldn't be harmed by another 48hr blackout+UV.