White spots on Green Monti Cap. What should I do?

[Subnautica]

Just got this frag a week ago. Suddenly it developed white spots (just 2 days ago). The only thing I did was water change, but it's barely 5% out of 75 gal. These white spots are growing kinda slow.

Should I frag the healthy parts out?

Water par:
- Ca 350
- Mg 1200
- KH 7.0
- NO3 25
- PO4 0.25

 

[tbrown3589]

Just got this frag a week ago. Suddenly it developed white spots (just 2 days ago). The only thing I did was water change, but it's barely 5% out of 75 gal. These white spots are growing kinda slow.

Should I frag the healthy parts out?

Water par:
- Ca 350
- Mg 1200
- KH 7.0
- NO3 25
- PO4 0.25

View attachment 2818235

Did you inspect for pests? I'd flip it over in the water and look for little nudibranches. Mine started showing signs like that and it was Monti Eating Nudis.

 

[Subnautica]

Did you inspect for pests? I'd flip it over in the water and look for little nudibranches. Mine started showing signs like that and it was Monti Eating Nudis.

Yes, pretty sure I inspected it and saw no sign of nudis. But even if it had some, the frag was completely healthy when it was at LFS. Doesn't it make no sense when nudis popped out of nowhere right?

 

[tbrown3589]

Yes, pretty sure I inspected it and saw no sign of nudis. But even if it had some, the frag was completely healthy when it was at LFS. Doesn't it make no sense when nudis popped out of nowhere right?

Often they come in as eggs.

 

[welsher7]

Often they come in as eggs.

And the when they hatch they will feed on the underside of the coral for sometime before moving topside. You could have the coral for weeks before noticing any damage to the top surface of the coral.

 

[Subnautica]

And the when they hatch they will feed on the underside of the coral for sometime before moving topside. You could have the coral for weeks before noticing any damage to the top surface of the coral.

Ok I'll check again later. How do I treat it? I don't have any coral dip.

 

[Ghost25]

It's possible it's a pest, but nudi damage doesn't tend to come all at once on the surface like that. I'm inclined to think it's an alkalinity issue. 7 is pretty low. Has it been stable?

 

[welsher7]

I had this happen over the course of 2 nights. Prior to that they only eating from the underside of the colony.