Acan dying (+not having luck with LPS)

[Katze]

Hello everyone !

I've kept this aquarium for a year now, but only kept corals for 1-2 months (so I'm not that experienced in terms of corals especially in placement)
Today I lost my paraancora euphyllia after 1-2 months working on saving it. And my acan started dieing after a month of well being here's everything that you may need to know:
I moved the acan maybe at a total of 3 times with atleast 7 day intervalls.

Current Parameters:
Salinity: 1024-1025 (very slowly increasing to 1026 by waterchanges)
PO4: 0,36 ppm
NO3: 50-70 ppm
I'll get the rest next day.
- doing a 10-15% waterchange per week
Pests:
I have never ever seen any pests not on this frag nor on others

Livestock:

Scopas tang
Ocellaris clown
Chrysiptera Hemycianea (bluedevil damselfish)
Nemateleotris Decora (purple fire goby)
Synchiropus Pictoratus (picturesque dragonet)
Lyretail Anthias

Filter system:
Protein skimmer, some sponges, filter sock (cleaned once or twice a week), activated carbon, some ceramic filter ring


Other infos:

1st time I placed them to a higher location there after a week or two the tissue rapidly receded but not the polyps, 2nd placed them to a lower light area polyps receding, 3rd placement is the current for now the tissue recession seems to be very slow but comparing to my 1st weekly and 2nd weekly photos the dying can be seen + I don't feed them daily (I never knew you can overfeed corals).

Questions:
What should I do?
(+I want to try again an acan, where should I place it to be sure ?)

Picture(s)

current place:

 

[mjw011689]

What light and size tank do you have? Nitrates and phosphates are a bit high, but I wouldn’t think enough to kill acans. How about flow? What do you have there?

 

[Katze]

What light and size tank do you have? Nitrates and phosphates are a bit high, but I wouldn’t think enough to kill acans. How about flow? What do you have there?

Size: 200l
Flow: in my opinion it's low (maybe too low ?)
Light: low/moderate (Maxspect ethereal)
BUT as I said I'm very bad at placement
ALSO their tentacles are always out.

 

[Tired]

Tentacles out likely means they're hungry. Feed them! Frozen or pellet food works fine.

 

[Katze]

Tentacles out likely means they're hungry. Feed them! Frozen or pellet food works fine.

As I said I fed them every day they started to die so now I only feed them once a week or is that not enough?

 

[Tired]

How are you feeding them? Once a week should absolutely be enough with the right foods.

 

[Katze]

How are you feeding them? Once a week should absolutely be enough with the right foods.

Mysis 1 piece per head.

 

[Katze]

For now I can only guess too much light, any opinions?

 

[Tired]

Hm, okay, it's not the feeding then. You might still be seeing some backlash from overfeeding (which causes the food to rot inside them), or, yes, too much light might be possible.

I also wonder if an iodine dip might be worth doing, in case there's some sort of infection happening.

 

[Katze]

Hm, okay, it's not the feeding then. You might still be seeing some backlash from overfeeding (which causes the food to rot inside them), or, yes, too much light might be possible.

I also wonder if an iodine dip might be worth doing, in case there's some sort of infection happening.

I've done dipping on it every time I saw health deterioration. Next day I'll try to rent a PAR meter maybe that'll help.
But I can do it again.

 

[Tired]

If you've already dipped, probably best to leave 'em alone. Dipping can be hard on corals. Except zoas and iodine, they love that stuff.

 

[Katze]

If you've already dipped, probably best to leave 'em alone. Dipping can be hard on corals. Except zoas and iodine, they love that stuff.

Even if it was over a week ago ?

 

[Tired]

If the problem was being caused by something that could be dipped away, the prior dips should have at least helped with that. Unless you saw notable recovery after the dips, leave 'em alone.

 

[Katze]

If the problem was being caused by something that could be dipped away, the prior dips should have at least helped with that. Unless you saw notable recovery after the dips, leave 'em alone.

The problem is that the dips did not help much.

 

[cwerner]

The nitrates are definitely high enough to cause the sort of slow tissue regression that you're seeing.

 

[Pridedcloth3]

I'm gonna go with the super high nitrate

 

[Katze]

The nitrates are definitely high enough to cause the sort of slow tissue regression that you're seeing.

I'm gonna go with the super high nitrate

Well I've never been able to get them down, I'm starting to finish my algae reactor will that help ?
And are you sure ? The place where I bought them from, they had equal amounts of nitrates as mine.

 

[cwerner]

Large percentage water changes will help. That algae reactor will also help, but its easier with reactors to already be in a good spot with nitrates and tune the lights on the reactor to maintain your good nutrient levels, rather than depending on it to drastically lower them. Reactors, Scrubbers, and Refugiums usually take a while to get fully going.

 

[Tired]

What's that place's phosphate? Might be less about the amount of nitrate and more that your phosphate is only kinda high, not super high. Those need to be balanced.

 

[Katze]

What's that place's phosphate? Might be less about the amount of nitrate and more that your phosphate is only kinda high, not super high. Those need to be balanced.

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