Really need help with my sps

[Nicolas Dumetz]

Hi everybody,
Everything was doing well in my tank, corals were colored and growing. Everything begin last week: Friday all was great...saturday night I saw my digitata bleaching like crazy( like the picture) and one of my chalice turn brown. I test my water and everything was alright except my nitrite...they were at 0.5 and I don't understand how it build up. My tank is running since last april. So I did large water change sunday and I have'nt found any trace of nitrite after that but all my sps continued to bleach one by one.(every day one that was alright the day before is bleaching). So I continue to change 20 gallons (my total system is around 100 gallons) every day since sunday but my sps continued to bleach... All my LPS except for one chalice are fine. My parameter are PH: 7.8-8.0 NH4 :0 NO2:0 NO3: 10 PO4 :0.25 KH:10DKH and I keep my salinity at 1.025. All those parameter were the same before this crash...the only thing that might be higher is the KH due to water change. I thought maybe the ph was to low but everything was growing well with those values.I use Ro/Di water. I check with a multimeter for stray voltage but I saw nothing and I have a grounding probe. I did'nt change the light intensity for weeks.....Everything start in a 24h period. Don't really know what to do now....
Thanks for your help.

 

[Nicolas Dumetz]

And the temperature is stable at 78f

 

[kylathwe]

It looks more like RTN/STN to me...bleaching would just be at the tips. It looks like they are losing tissue. I would run some carbon if you have it. You said the alk is 10 now, but what was it before? Doing so many water changes causing your alk to swing could make it worse. Not sure what to tell you to stop it.

 

[Nicolas Dumetz]

My alk was at 9 before all the water change. And yes the coral lost their tissue.

 

[Mattewell]

If you are seeing nitrite, then that would indicate to me that you had ammonia in your tank. Did something die? Did you stir the sandbed recently? Did you use a cleaning product around the tank recently?

 

[Nicolas Dumetz]

My tank is barebottom so I did'nt stir the sand and I did'nt see anything dead. All my fish acting great. I use some frebreeze in the room but I was really careful make sure it was'nt close to the tank. So when I saw nitrite I tought it was the febreeze so that's why a change a lot of water but the corals continue to loose their tissue...

 

[jroovers]

How do you dose your Alk and CA? Is it possible they got irritated directly by alk?

 

[Nicolas Dumetz]

I dose it manually with red ses product twice a week....I don't think my alk swings a lot...There's one time a couple of months ago I increase my. Alk to quickly and one of my acro was bleaching from the tip but he recovered quickly...but now almost all my acro are loosing tissues that's why I did'nt thought it was the alk...

 

[ksicard]

I would agree about the ammonia being in the tank if there were nitrites. I'd run some carbon (1.5 cups), re test your water in case there was an error in testing, skim very wet, and keep changing water (instead of 20g WC every day try 20g WC every 2-3 days so your params dont swing to much). Other than the above I'm not sure what else you can do, are you positive nothing got in the tank like chemicals/metals/anything toxic?

 

[zombiereefer]

IMO and IME i would frag what you can. if you have to of course. but if every sps is RTN or STN your in trouble. just being honest, i think most of us that have kept a lot of sps have seen this. and i think it will just continue. i wouldnt keep changing water. i would run carbon for sure. no gfo or anything. and i would try and frag everything at least once. good luck

 

[zombiereefer]

def run wet skimmer and maybe change water if you think its something that got in the water. NEVER EVER EVER spray any aerosol in your room with your tank in it. that sits in the air and moves around the room. i could really see that as possibly it. if so you need to do wc if not then its a chemistry thing i wouldnt change any

 

[trueblackpercula]

Do you have any Pygmy angels or emerald crabs?

 

[zombiereefer]

i have both of those and not to hijack but do those give sps issues?

 

[Nicolas Dumetz]

I don't have any emerald crab or pigmy angel....I change a lot of water in the system in a week so I'll wait 2-3 days before doing another water change. If I see the RTN continue I'll frag what I can and hope for the best...
Thank you very much for your help