SPS issues

[jerrod]

I have been reefing since 2018 and have mainly kept mixed reef with heavy SPS tanks. I currently am running a 280 gallon tank (30"x30"x72") with a 50 Gal sump/refugium and 50 gal lowboy all connected. Current tank has been running for 2 years, for the last year everything has had stable parameters, has good Coraline growth etc but every single SPS coral dies within a week or two and I cant figure out why. Every other tank I had in the past I had no issues growing coral but ever since going to this new tank it seems like I cant grow SPS. I have a few euphyllia, Acans, large Maxima, shrooms etc that are fine.

Parameters:
Salinity 1.025
PHOS .013
Nitrate. 3-5
Ca 440
MG 1280
alk 8.7
PH 8.1-8.4

ICP analysis shows high Silicone, Vanadium and Lithium all other items are green
LI 480
V 9
Si 390

Lighting is Orphek V4's 16" above water(no par meter)
no stray voltage in display.
6 MP40's at 25-40%

So my question is what could be the issue, could this be bacterial. Could there be something in the display not found by ICP test (it is a used tank). Any help is appreciated as I am out of ideas and getting frustrated. I can post Pics once I get home.

 

[Tahoe61]

How about fish and inverts?
What sps specifically?
Have you run a UV?

 

[jerrod]

How about fish and inverts?
What sps specifically?
Have you run a UV?

inverts
Skunk cleaner shrimp
Nessarius snails
mexican turbo
Dwarf cerith and cerith
blue and red hermits

Fish:
blue green chromis x3
Lyretail Anthis x3
damsel fish x 2
female blue jaw trigger
Blue hippo
Dussemeri tang
Desjardini Tang
Mandarin goby x2
Pyramid Butterfly
clown fish x 4

I run protein skimmer, algae reactor. Dose nitrate
Have tried Anacropora, Acropora, Montipora, Stylos

I have not tried a UV light

 

[BryanM]

Doesn't really seem to be water quality to me, so that leaves light and flow. I'd rent a par meter so you can know what you're dealing with.

 

[Tahoe61]

I see no reason why Acropora and other sps would not succeed. Even simple sps like Pavona, Digitata?
The N/P levels are pretty low.

 

[UMALUM]

Might be a good idea to share exactly what your seeing when they're dying. " rtn, stn, top, bottom, color of skeleton after it's exposed. If your dealing with a really bad bacterial issue sometimes the skeleton will display a light brown to almost green tint rather than the usual bright white after recession. That pretty much means the coral is dying from the inside out. Your nutrients are low and within error of being almost bottomed out but I would think your LPS would be suffering unless you feeding them separately.

How long has this tank been setup?
Coralline doesn't always mean that it's clicking.

 

[Uncle99]

Phosphate at .013ppm would starve out everything.
Maybe you mean 0.13ppm which would be right on point.

 

[Science/G]

Nitrates, phosphates and magnesium are low IMHO . Is this the reason? Or is it this combined with lighting and flow? Trace elements? Maybe an ICP test will shed some light.