Acan Lord having bacterial infection or something else ?

Katze

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Hello everyone !

I need help with an Acanthastrea Lordhowensis frag here's everything that you have to know:

Aquarium backstory: now 1 year and a month old, first corals were kenya trees and discosomas then a quick jump to this year's january I quickly gained interest in other corals like zoas and well, acans. I bought my 1. acan 1-2 months ago it started receding I've done weekly dips on that colony and so with 3 heads it survived (out of 5). I never dipped any corals but I bought Red Sea's DipX so from now on I'll do those dips.


Parameters:

salinity 1025-1026 (daily swing)
PO4: 0,16 (measured on Hanna ULR 2-3 days ago, dosed LaCl for this)
NO3: 100-70 (measured on Salifert, I need help on this too never changes, never drops nor does it increases)

I don't measure the rest, I'm doing 10% waterchanges a week and I'm only keeping the 2 acans that would decrease anything.
- the other acan doesn't even care about these and don't even mention the zoas they love it
Equipment:
Lighting: Maxspect Ethereal 90% B, +60% W, the others are either 15% or 10%
Skimmer: Bubble Magus C5 (cleaned 2x / week)
Filter Sock: cleaned about 2x / week
Tunze AC wavemaker

Livestock:

Scopas tang (not picking at corals)
Lyretail Anthias
Clown fish
Fire goby
Pict. Dragonet
Damselfish

CUC: small brittle stars and bristle worms + copepods and limpets

Dosed things:

LaCl
NOPOX (can I continue ? will it speed up the recession ?)

Filter:

ceramic filter rings
Sponge
Activated Carbon
Refugium ( algae won't grow, not even since the start of the refugium)

Total system volume: 200l
About the coral:

No dips when added.
Received 4 weeks ago, did not open for a week placed it to a new location, opened for a full week and after that it closed up yet again and I did not move the frag.
I did do maybe 1 or 2 iodine dips but this time not as in high concentrations as in the other.
Feeding it weekly sometimes 2 times a week.
-About the recession:
Usually a place whitens out then dies off after that the skeleton is showing, and then pink-ish skeleton comes NOTE: this always goes AROUND the polyps never directly into them.

I'll upload pictures today.

So yes I need help to save what can be saved.
Feel free to ask questions !
 
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