What’s on my pulsing Xenia that is killing them?

[Bradsreeftank21]

There’s a brownish stringy stuff that keeps wrapping/hanging onto my pulsing Xenia’s and it’s killing them. What is it?

 

[wonroc]

Turn up the white light to see better

 

[Bradsreeftank21]

Turn up the white light to see better

Here’s the same junk on my zoas

 

[j.falk]

Dinos would be my guess.

 

[homer1475]

Looks to me like it could be dinoflagelletes(sp?)

Can you get us a better pic, and perhaps a full tank pic?

 

[vetteguy53081]

Its dinos and that would do it.
Are you using RO or tap water from the faucet? What is your phosphate level ??
To battle this, since it is very light in density of dino, as soon as tonight or tomorrow night turn lights off for the next 3 days . Using a turkey baster blow this stuff loose and net or siphon it up. At night, add 1ml of hydrogen peroxide per 10gallons for the next 5 nights.
During the day, add 1ml of liquid bacteria per 10 gallons.
Continue to feed fish as normal BUT DO NOT FEED CORAL FOOD TO CORAL OR ADD NoPox to tank which will feed Dino.
Day 6, turn blue lights to normal schedule and whites at 10%, then add whites 5.% each day until normal schedule.