Corals not doing well

[CWalters]

Been having a problem with most of my corals in the tank. Lost a Goni, a Duncan.

My other Duncan isn’t looking too hot, my zoas aren’t opening up anymore and look like they have a brownish algae coating them that I blow off daily.

Params

Temp:78
Salinity: 1.025
Nitrate: 8.6
P04: .04
Mag: 1440
Calc: 440

Any ideas what else could be affecting them?

 

[Nate Chalk]

How olds the tank. Do you have pictures. What's ur alkalinity

 

[CWalters]

How olds the tank. Do you have pictures. What's ur alkalinity

Tank is a year and a half.

Forgot alk and PH.. just tested now at lights off.

Ph is 8.03 (this should be going up this week as I just installed a C02 scrubber connected to an outside airline to my skimmer)

Alk was 7.97 which is low

 

[ReefingDreams]

Pics of tank.

 

[Reefkeepers Archive]

Tank is a year and a half.

Forgot alk and PH.. just tested now at lights off.

Ph is 8.03 (this should be going up this week as I just installed a C02 scrubber connected to an outside airline to my skimmer)

Alk was 7.97 which is low

Thise parameters are basically perfect, so those aren't your problem. How high light/flow did you have those corals in? What's your stock list (fish, coral AND inverts) did they die as tissue necrosis/RTN/STN, bleaching or decay of some sort. Have you done an ICP recently or in the past?

 

[Nate Chalk]

Yep if ur testing is perfect. Then it's flow. Lighting change or ICP test for heavy metals

 

[CWalters]

Lights have been off an hour and says pic is too big, will try again tomorrow

Lighting I have xr30 gen 4 (2 of them)

Mp40 on reefcrest 45% (75 gal, 4 foot tank)
Nero 3 on opposite side

Just got an icp test kit that I will send out tomorrow