Losing my SPS Corals (1 Viewer)

[Fr4nkTheT4nk]

Hello Reefers,

I upgraded My tank about a month and a half ago. The first 3 weeks looked fantastic but after that, I started losing SPS Corals RTN or STN But like 1 after the other.
I am coming from a 140-gallon system to a 280-gallon system. The parameters look good.
Alk 8.80
Cal 449
Mg 1331
PH 7.9 to 8.3
Salinity 1025
Temp around 77 to 79
Nitrate 15
Phosf 0.11

I have lowered my lights a bit to see if that will help but keeps happening. Any advice

 

[BigRick]

IPC

 

[reeftopia]

Last time that happened with me I lowered my whites to ten, that helped immediately

 

[gm357]

Your tank maybe too clean. Did they slowly lighten up then die? Or overnight?

 

[Reefahholic]

How long have you been keeping SPS? Most likely a swing. It could be source water related. It would be good to know your zinc, potassium, iodine, levels.

 

[Cody]

How long have you been keeping SPS? Most likely a swing. It could be source water related. It would be good to know your zinc, potassium, iodine, levels.

Are these levels folks are looking at in relation to STN/RTN? I can't imagine there being enough of a swing in those without dosing them. There's not a lot in NSW to begin with, coupled with slow consumption rates.

 

[Reefahholic]

Are these levels folks are looking at in relation to STN/RTN? I can't imagine there being enough of a swing in those without dosing them. There's not a lot in NSW to begin with, coupled with slow consumption rates.

I’m just talking about any swing in general. Salinity, Nutrients, Alk, Temp, etc…

You see a lot of issues with overdosed Zinc in source water. Low or overdosed Potassium can be a major issue. Couple a few of these with depleted Iodine and Fluoride and things start to get irritated and check out.

I believe the number one killer of SPS is low Phosphate. Swings are a close second. I always start with those two and work from there. In this case, his nutrients look ok. Would be nice to see some full data on this system. I bet I can pin it down.

With that said…

 

[Cody]

I’m just talking about any swing in general. Salinity, Nutrients, Alk, Temp, etc…

You see a lot of issues with overdosed Zinc in source water. Low or overdosed Potassium can be a major issue. Couple a few of these with depleted Iodine and Fluoride and things start to get irritated and check out.

I believe the number one killer of SPS is low Phosphate. Swings are a close second. I always start with those two and work from there. In this case, his nutrients look ok. Would be nice to see some full data on this system. I bet I can pin it down.

With that said…

Oh that PO4 one is one of the most overlooked factors. For instance, I can have an alk swing of .5-1dkh in a day and my tank doesn't bat an eye. My PO4 recently crept up to .13ppm. I did a 20% waterchange and replenished my GFO. Haven't tested it after, but within two days, a branch or two of SPS sheds skin. Low or unstable PO4 is such a wrecking ball when it comes to SPS.