Logo receding at night

[Mord3004]

Hi Guys,

Normally don't post on here but I'm in need of a bit of help. I enjoy lps with lobophylia being one of my favorite.

My problem is during the day the corals do extend but ad soon as the lights go out at night it recedes so badly it looks like it's going to tear through the flesh

Its a recent occurrence with the following tank parameters

Temp. 25
Ph 7.93- 8.02
No3 10
Alk 10.2
Mag unsure
Cal 510

Could the high no3 be the problem??

Thanks in advance

 

[kfisc]

While your water chemistry might need work (good to get a mag test), it's not unusual for them to react to light shifts. If you come back several hours later in total darkness with a flashlight, I'm curious if you see it somewhat expanded again with tentacles extended.

 

[djryan2000]

Logo receding at night

While your water chemistry might need work (good to get a mag test), it's not unusual for them to react to light shifts. If you come back several hours later in total darkness with a flashlight, I'm curious if you see it somewhat expanded again with tentacles extended.

Is it not normal for polyps to recede in corals overnight? Most of my corals, especially my digitatas, stylos, and zoas, retract their polyps at night and are open within an hour of the lights coming on.

I've yet to find any evidence of pests which was my first thought before I assumed it was normal.

Edit: photos to show what I mean

This is what my tank looks like every night.

 

[Mord3004]

While your water chemistry might need work (good to get a mag test), it's not unusual for them to react to light shifts. If you come back several hours later in total darkness with a flashlight, I'm curious if you see it somewhat expanded again with tentacles extended.

WAter chemistry needs work could you provide some pointers? is NO3 the problem?

Yes , 2 hours later its up again, so weird.

 

[kfisc]

If your readings are in parts per million, the nitrate is not terrible, nor are the other readings, but the Mag is useful to know as it can give an indication of how well your corals can process and use the water chemistry. I like Salifert kits.