what is happening with my sps..

[sienki]

Hello
Im Marcin from Poland, my tank is 120x60x55 cm ~ 400l

I have an aquarium with 3 years .. but problems until now.
I had temporarily increased levels of PO4, now there are about
parameters:
PO4 0.07
NO3 detectable (0-2)
Ca 400-410
Mg 1470-1500
Kh 6,9-7
I use Balling and microelements of AquaForest.

At some point, all my died acropora and montipory disc.

Now something slowly from the inside and getting to my Seriatropory Stylophory and others.

Aquarium in a few months:

and now ...

If you have any ideas, please tell me .. currently thinking about liquidation aquarium ..

 

[toromp]

I'd say redbugs and or montipors eating flatworms

 

[Reef Bass]

Monti eating nudibranchs chew up plates like that and are tough to stop. Doesn't explain stylo or birdsnest trauma though.

 

[sienki]

not see any bugs .. I watched carefully .. during the day and at night with a flashlight ..

I wonder more lack or excess of any element.
or Asteriny .. but I think they only feed on dead corals?

my stylo not yet deeper tissue loss ..

other suggestions?

now only gives Balling (kh, Ca and every 2 days without NaCl salt)

 

[MammothReefer]

I'd double check your mag, maybe use a different kit. You are running it on the upper end already. I've had similar things happen when I get above 1600. It's usually montis, and BN's that show issues first.

 

[sienki]

I'd double check your mag, maybe use a different kit. You are running it on the upper end already. I've had similar things happen when I get above 1600. It's usually montis, and BN's that show issues first.

I bought a new test salifert, I have 2 of this company with different measuring methods (new and old), the two shows are the same.
suggesting lower Mg? exchange of water with salt low in Mg ? do you recommend anything?

and where the Mg? if it did not add .. corals grow its consumption should be .. or not?: Sad1: