Dinoflagellates or something else?

[Nitzanah]

Hi everyone!

About a month ago I noticed this brownish stuff on the sand bed and then I noticed my bubble coral, hystrix, lepastria and other corals started to slowly die off. Then this hairy looking algae started to grow in my rock. It's mainly on the top of the rock in the better lit places. I think it's Dino but I'm not sure. I've done a three day blackout and nothing changed. I've been raising the ph (currently 8.4) and have dosed with peroxide and nothing has worked.

Any ideas as to what this stuff is? Is it dino or something else and what can I do about it?

Water Chem
Ph - 8.4
Am 0
Nitrite 0
Nitrate 0
KH - 10dhk
Phos - 0 [TABLE="width: 100%"]
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Tank has been up for about a year.n
Light is a maxspect razor R420r 60w

I recently changed the light cycle at the suggestion of my lfs
Tp1: 8:30 a:0% b:2%
To2: 9:30 a:0% b:20%
Tp3: 14:30 a:20% b:65%
Tp4: 19:30 a:20% b:65%
Tp5: 21:30 a:0% b:20%
Tp6: 23:30 a:0% b:1%

The tank is a 20g innovative marine nuvo
I'm using the three stage sponge filter baskets, have a nano refugium and protein skimmer and an ato
Water temp is 82

 

[ValG]

I think it's something else. Dino looks kind of slimy and very often has little air bubbles trapped in it.

 

[Balz3352]

Close up? And or Google and try to find a pic of it. Unfortunately one parameters is allowing these to grow but also hides it because it uses it so font rely on parameters

 

[Shaunv]

Here's a link to a decent nuisance algae guide

https://www.reefcleaners.org/nuisance-algae-id-guide

 

[Nitzanah]

It's hard for me to identify it. It doesn't look like any of the photos. It's brown in the tank and green if I pull it out and put it under normal light. It's not long and hairy, more light short, tangled bushes.

 

[deboy69]

Byropsis or Gha

 

[SynDen]

ya sounds like byropsis

 

[mwirth1]

I just had an issue with dinoflagellates in my tank and it looked different than yours.