Monti dull colour & Digitata going white

[arpr30]

Hi need some help, my tank is 6months old, already having Coraline.
All my LPS are healthy and fat.
But i have an acropora, it's very healthy.

But i never had success for Monti, Digitata, Fireforest and Birdsnest.
The Birdsnest and Digitata looks like STN in 2months.
Monti's polpy are extending, but very pale colours, some have like a brown coating on it.
Refer below pics

Parameters
N03 - 25ppm
P04 - 0.25ppm
Kh - 8.3dkh
Mg - 1350ppm
Ca - 420ppm
Ph - 8.2

Running fuge + Nopox
1week back started AF Phosphate minus in a reactor.

 

[Parrottbay]

IMO, since no else is chiming in. Those could be 4 things.

1 chemical burns from dosing. I think very unlikely

2 pest like monti eating nudi, semi likely as it looks like patches but less likely you're not seeing them.

3 coral warfare like stings from a chalice but also less likely as it wouldn't affect all of them but maybe some due to not seeing entire tank.

4 my real guess would be, your levels. Phosphate is over double where it should be and it's preventing coral growth. Your alk, calcium and magnesium levels are low to where I would recommend but are still in acceptable range.

I would do a water change to get the phosphate levels lower. Have you seen any pests or would you even know what they look like? There's a chance if you have them and they're kinda being managed by a predator like a wrasse or mandarin.

 

[arpr30]

IMO, since no else is chiming in. Those could be 4 things.

1 chemical burns from dosing. I think very unlikely

2 pest like monti eating nudi, semi likely as it looks like patches but less likely you're not seeing them.

3 coral warfare like stings from a chalice but also less likely as it wouldn't affect all of them but maybe some due to not seeing entire tank.

4 my real guess would be, your levels. Phosphate is over double where it should be and it's preventing coral growth. Your alk, calcium and magnesium levels are low to where I would recommend but are still in acceptable range.

I would do a water change to get the phosphate levels lower. Have you seen any pests or would you even know what they look like? There's a chance if you have them and they're kinda being managed by a predator like a wrasse or mandarin.

Hi there,
Yup i feel the P04 too.
What levels do you recommend for P04, Ca, Mg & Alkanity?

I did see some worms, few months back saw 1 nudi on a monti frag, and i disposed it, since then didn't see any nudi.

But what confuses me is, I have 1 big red monti which is healthy. (See pic)