Corals not happy...

[Mr_Banana_Pants]

I was looking at my frag tank today and it seems like the hammers, torches, and frogspawn are not as bright and vibrant as they usually are. I tested my chem and here is what I got:
Temp 74
Salinity 1.023
pH 7.9
Ammonia 0
Nitrite 0
Nitrate 20ish
Phosphate 0.08
Alk 9
Calcium 440
Iron 0
Iodine 0.06
Potassium <320

 

[Mr_Banana_Pants]

My biggest question is does the iron Iodine and potassium make a big difference?

 

[ebushrow]

Temp seems a bit low...has it always been at 74? Seems cool, but if it has been working for you, then it's not an issue.

 

[AllSignsPointToFish]

My biggest question is does the iron Iodine and potassium make a big difference?

Nah, not over the short term. How long have you had the frags? Did you acclimate them to your light?

 

[Mr_Banana_Pants]

They've been in the tank for about a month now. I set it up after tearing down my display tank. Running an LED with T5 supplement, 8 a.m. to 8 p.m.

 

[AllSignsPointToFish]

You may have too much light. Try backing the lighting down a bit.

 

[Mr_Banana_Pants]

Will do... how many hours do you usually recommend for light

 

[BigJim]

If your led and T5 are full intensity for 12 hours, too much light could be the issue. I have Kessil 360WE led's and 4 T5 retrofits on my mostly SPS tank. I ramp the Kessils up for 3 hours, run them at 85% with the T5's for 6 hours, then turnoff theT5's and ramp down the Kessils for three hours.

 

[saltyfilmfolks]

id say its the diatoms or the algae that's growing on the frag racks. The zoas are doing the umbrella thing. that's usually in indicator of a chemical stressor. Id run carbon or freshen it. A WC wouldn be a bad idea.
after a month they should be acclimated to the light.

 

[Mr_Banana_Pants]

I just did a large water change, maybe 40%, about a week ago. And the carbon is only 2 weeks old. Two weeks ago I added a dual reactor using gfo and carbon

 

[saltyfilmfolks]

interesting. not sure how you have Po4 in a frag tank with that aggressive use of gfo.
fwiw the nasty stuff on the rack is pretty common.

 

[AllSignsPointToFish]

How you seen any dark strings coming out of the mouths of the euphyllia?