Acropora trouble

I've had this acropora for about 7 months. The whole skeleton used to be a much brighter green. My water has been stable and fine the whole time. I'm wondering if it's slowly been deteriorating from too much light intensity.

 

Please list specific parameters for Ca/ALK/Mg.

Lighting type and intensity if you are using LED's?

Is your system an ULNS, what mediums are you runnng ie:Biopellets.....

How large is your fish load and how often are your water changes, basically is the coral starving?

Moved to--------SPS.

 

NH3 – 0.0
NO2 – 0.0
NO3 – 0.0
PO4 – 0.04
Mg – 1260
dKH – 10.2
Ca – 320
Calcium is down a little from my last test. I have a 48" 216 W T5HO over a 55g. I doubt my tank could be called low nutrient. Fish load is 2 chromis, a clown, and a banded sleeper goby. I change 20% every 2 weeks. I have a 30g sump with a 12g refugium and just use filter socks and a good skimmer. I've been dosing the kent 2 part for a couple months now. Could it be phosphates?

 

your alk is very high if your po4 is truely at .04 and nitrates at 0 you are running a ulns system. in which case your tank should be running at Natrual Sea Water. which is alk 7-9 ca 420-450 mg 1200-1400

has your alk spiked recently?

 

Alk is very ideal for acro. It's about 3.6 meq/L. 7 is too low for sps, ime. I would shoot for 9-11.

I browned out some coral with lighting intensity, so that's a potential cause.

Good luck.

 

Browning out is probably a good description of what I'm seeing. I introduced a monti at the same time as this frag and probably photo-shocked it. These are my first attempts at sps and I was actually more concerned about the T5 not being bright enough, but I think I've changed my opinion.

 

This is the highest alk I've ever measure, but only by 10%

 

These are my thoughts as well. Also it can not hurt to let the Alk drop slowly.
You also might try adding some type of amino acid product such as AquaVitro Fuel.

It's not the lighting so next you have water chemistry.

If you have not checked for red bugs that would also be my next move. If they are present everything already posted is a mot point except possibly running a lower alk level.