High nutrition cause Acros pale color?

James-reefer2017 · Feb 17, 2021

I got 2 Acros losing their colors, one from green, one from yellow, both are pale now.
KH-8.5
Cal-430
Mg-1300
PO4- 0.75
NO3- 50-100
I know PO4 and NO3 reading are bit ridiculous, but that’s the way how my tank all SPS got survived from very low. so I decide to let it be. I don’t see any GHA problem. All Corals are ok except these 2 Acros losing colors, becoming pale, not bleach), I thought that only low nutrition causing that. That seems it’s not this case in my tank. Any advise?

Hincapiej4 · Feb 17, 2021

It could be flow. Your flow would provide them those nutrients. Maybe you need a bit more ? It depends, you know better than I if you need more. Is your ALK/PH stable...(actually, naw that would just cause stn/rtn....)

...Yea, I'm going with flow.

mdb_talon · Feb 17, 2021

High nitrates/phosphates can cause acros to lose color. That would be my best guess with those numbers.

James-reefer2017 · Feb 17, 2021

Hincapiej4 said:
It could be flow. Your flow would provide them those nutrients. Maybe you need a bit more ? It depends, you know better than I if you need more. Is your ALK/PH stable...(actually, naw that would just cause stn/rtn....)

...Yea, I'm going with flow.

Alk/ph are stable , you mean flow too strong or weak? The thing is that they were good for long time, it happened recent week. They r always in the same spot

James-reefer2017 · Feb 17, 2021

mdb_talon said:
High nitrates/phosphates can cause acros to lose color. That would be my best guess with those numbers.

That’s my concern too, I think I’m trying to reduce them little by little to see how it goes

X-37B · Feb 17, 2021

James-reefer2017 said:
Alk/ph are stable , you mean flow too strong or weak? The thing is that they were good for long time, it happened recent week. They r always in the same spot

Yes but how long have your numbers beem this high?

James-reefer2017 · Feb 18, 2021

90's reefer said:
Yes but how long have your numbers beem this high?

It’s been long time at lease half year ,since all corals are fine , so I didn’t try to reduce them, especially I don’t see any green algae problems . At 2019, the best growing and coloring for my SPS is the tank with green algae problems.