Need help! Think it’s GHA and Dinos

[leighton.bingham]

Current state of my tank. Not sure what kind of algae it is but it’s got to go it’s everywhere and everything is dying off.

PO4 is at .08 and NO3 is at 4. I can send more numbers if needed.

thanks in advance for help

 

[OfficeReefer]

I think you might have answered your own question?

I see what appears to be a little bit of both in the images. I recommend to monitor and likely bring everything down, starting with the lights off for the next 24-48 hrs. Any other corals than the NPS shown in the third image?

Depending on how long this tank has been in this condition, you may be entering...

The Ugly Zone (or stage)

I presume the other coral perked up is the only other one remaining. This is one of your warning indicators that something is amiss. I recommend once your lights are off, check your temp, salinity, alkalinity, pH and phosphates/nitrates to start. Record everything down but you will want to keep things (including salinity of new saltwater you are making from RODI) in the range of

75-78 F
1.023-1.025
8.1-8.4 dkH (consider 9+ on SPS dominant or fast growth tanks)
8.0-8.3 pH
0.01-0.1 PO4 ppm (don't bottom out)
0.01-3.00 NO3 ppm (don't bottom out)

Make new saltwater with similar (if not identical) salinity and temp, wait 24hr to use. Consider at least 15-20% water change and repeat checking parameters. You may need to be ready to do another water change again, as having the lights off and keeping the room dark will result in slow algae die off and increased nutrients, which you'll need to remove again. I would also consider adding at least 16oz or more of several copepod varieties to your tank, maybe consider several snails, small urchin if desired. If you have a sump, you can build a refugium with macroalgae to consume this for you.

What does your lighting look like and could you share with us more about the tank?

 

[taricha]

I see small frags on large algae dominated rocks. I'd pull a rock, scrape, maybe peroxide, rinse it externally, and then replace. The small frags can be detached and moved around as needed.
that's going to be far easier than trying to remove that much nuisance algae from inside the tank.