help with my acropora, 1 by one are dying

as the title is saying. I am starting to lose a lote of corals all of a sudden. First I lost a nice big pink tip acropora. Then i lost 2 acro millepora from RTN. I discoverd that my refractometer was not good and bought a DD ocean, calibrated it with RO water and discoverd my salt was to low. 1.019

so I used my topoff water to ad salt to my system. Now a lot of corals are showing STN and a sh*t load of them died of RTN

My system

Tank 120x60x65cm (water 57)
sump 100x40x40cm ( water 20)
fragtank 60x80x30 ( water 25)

Light

2x kessil 360WE
1x kessil 160WE

1x kessil 160WE on the fragtank
color 40% power 75% ramp time up and down both 180Min total light time from 9:30 till 22:00

flow

maxspect gyre 150 at 80%

filter techniek
ATI powercone skimmer
biopellets
active carbon

suplements

triton base dosing
2x a day


water

no3= 5
no4= 0.03
kh= 8.95
ca= 425
mg= 1400

fish

chelmon rostratus
tang
2 clown
Henkie
3 gobies
2 dragon gobys
2 dragonface pipefish
2 cleaner shrimp

I got the following acropora and millepora ( still alive)

4x millepora digitata
2x plate millepora
3x acropora nana tricolor ( 1 showing STN had to frag it)
2x acropora millepora ( 1 half died of RTN)
3x seriatopora
2x acropora frogskin
1x acropora desalwii
1x blue typ acropora white/brown base





The order the where added to the system is as follows.

the where added in 3 steps in a time periode of 3 to 4 weeks. everything not specified are older than 6 months +

fase one

the pink ( RTN)
acropora millepora (RTN)
acropora nana (STN)

fase two

2 pink millepora ( half RTN, 1 OK)
2 purple millepora ( 1 RTN, 1 OK)
1 yellow millepora ( 1 RTN)
1 blue acropora dont know the name ( OK)
2 desalwii ( both STN but moving realy slow)
1 frogskin yellow ( STN stopt, i think)
2 acropora nana tricolor ( OK, only lost color but getting it back)
2 millepora digitata ok



fase three

acropora enchinata (RTN)
frogskin green is ok butt lossing a bit color
acropora blue tip white/brown base had a acropora eating crab.

Now dont think, holy ..... where is he leving al these corals. The are small. like max 6x6x6 cm and a couple where to give away as a gift.

Unfortionetly i discoverd after these additions that for the past 9 months my tank was running on a 1.019 sg and not at 1.025. the first RTN started after the last fase ( o yeah that was like a big .....:headwally:). the last one that was getting RTN last night.

How do i stop The STN and possible RTN? Is it the flow, is it becaus of the low selinity i had.

I am going crazy over this. All corals come from the second fase from a transhipping from bali.
 
Get some calibration fluid for the refractometer. You want to calibrate at 35, not at 0, even though the instructiosn say 0 calibration is OK it's not for a reef tank.
 
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