LPS Bail Out But Why?

[ThatsNoMoon]

Hi all,

A month or two ago the head of my scoly came off the skeleton but everything else was fine, last month my two heads of frogspawn lost the heads overnight. This week my Acan lost a head and my macomoussa last 4 and my candy cane has lost 2.

The heads are bailing out and I have no idea why at all.

Here are my parameters tested a few hours ago:

Ammonia: 0
Nitrite: 0
Nitrate: 5
PH: 8.0 (stable here, will be adding NSW to bring it up soon)
Phosphate: 0.10
Mg: 1360
Alk: 8.1
Ca: 450
Temp: 78

Numbers like my phosphate or PH may not be ideal but they have been stable there for around 6 months. It's just suddenly that things have started dying. I am running Chemipure Blue, Carbon, a Phosphate remover in a reactor (new) and PolyFilter.

Does anyone have any idea what could be causing the bailout? I was worried it was too much flow so I turned off one of the wavemakers. Everything looks like it has a gentle flow around it. The Green Slimer SPS I have looks like it's super healthy. The LPS heads I still have look super happy and open but they suddenly just lose the head overnight or over the course of a day.

The only thing that could be bothering them is a slightly large hermit but I don't see him on the corals.

all the coral in the tank are dipped when added and also the rock was dry rock. I see no pests in the tank at all that are around the upset corals.

Any advice or ideas would be massively appreceated

 

[MnFish1]

What kind of fish do you have?
Have you done anything new to the tank before it happened (i.e. changed carbon, etc) - something that could have changed the light intensity, etc.

 

[ThatsNoMoon]

What kind of fish do you have?
Have you done anything new to the tank before it happened (i.e. changed carbon, etc) - something that could have changed the light intensity, etc.

3 tangs, 6 line wrasse, mandarin, pistol shrimp, watchman goby, 2 banggai, royal gramma.

It's been going on since November so just normal maintenance like changing carbon bag in filter sock, changing out filter floss ect. Nothing special or new.

I wiped down the water top-up chamber the earlier today day and the tissue had a pinkish/orange tint to it. I wonder if there could be something going on with my RO/DI. I just changed out the DI resin and I'm getting 0TDS but I'm not sure what it was before. Maybe I felt the resin in too long? would that cause an issue?