Trachy coral receding mesenterial filaments

[reef350]

Hi, everyone please help.
Happened after 2 weeks i got it , now another 2 weeks after its been receding faster only in the areas where mesenterial filaments are out.

Ive done cipro (4hrs) and general pest dipping (30 minutes). Any help would be appreciated, has only happened once over the last 10 years in the hobby and that coral died. I do dose lanthanum but only through red-sea dosing unit to maintain phosphate.

Picture here ( couldn't get the image upload to work)
https://ibb.co/h225GQ6
Params
Alkalinity: 9.2
Calcium: 412
Phosphate: 0.05

 

[cloak]

How old is the tank? What's "lanthanum?"

 

[reef350]

10 month old tank,
Lanthanum chloride used to lower phosphate, like GFO but in liquid form

 

[cloak]

Hmm...

Where is the phospate coming from? Couldn't you just cancel this out?

Sorry, "Lanthanum" is something I've never heard of.

 

[reef350]

General feeding but i dont dose very much (4ml daily) after adding alot of seachem pristine (bacteria). Ive been doing this for 6 months, all other corals , fish look great including other trachys

 

[cloak]

Do you think you can lose this and still achieve the same results?

 

[reef350]

Do you think you can lose this and still achieve the same results?

I can stop to see, but i dont think thats the cause