Algae problems- id and fix please

[Rim_Reefer]

So i have been struggling with my tank for about 2 months now. Let me start with some basic info.
175 gal bowfront
t5ho 6x80watt-only running half due to algae lights are 2 months old
phosban reactor and carbon
20gal ref with mixed macros revers night cycle


Heres a pic of the algae


I have been manually removing it as much as i can every othe day for 2months plus cut back on feeding and lighting as well as changing gfo/carbon biweekly. I tried scrubbing my rocks once and it cleaned the algae really well but killed 3 of my fish which probably didnt help the situation. Can i safely scrub the rocks again. Also my ph was very low but i found the problem due to inadequate o2 in the house from a natural gas heater. I plumbed a small fan into the canopy from outside and that keeps the ph up around 8.0 a little lower than id like but it should work.
Any ideas /comments

 

[knugenx]

i do believe that's Dinoflagellates.

 

[Rim_Reefer]

looking for info on it but dont know much about it have any links on it or info.

 

[reefman]

http://reefkeeping.com/issues/2006-11/rhf/index.php

 

[junglebase]

all i can say is YIKES!!!! not to discourage you but that algae made a lot of reefers leave the hobby... that is one of the most difficult algae to battle... just ask ZANYMASTER....

 

[dubs]

u can try emerald crabs they work i was having a algae bloom i throw a few in my tank my rock are looking nice again

 

[daaznmofo]

i would try syphoning it out everyday cuz it builds up quickly and how often do you do water changes?

 

[Tim]

Is it just on that rock? If so can you take it out?

 

[cowfish]

+1

 

[Rim_Reefer]

its everywhere i have been siphoning it out every other day i will try daily now. I normally change 20-25 gallons once a month. I really dont want to break down the tank but its definately everywhere. Does this need light to grow. Maybe i can take out the coral and leave it with no light for a few weeks.