Help! Happened overnight

I am using leds, but it's a combination of RB, NW (Cree) and combo chips - 20W and 2 DreamChips 100. Never had problems until now... This coral was in my tank for about 2 months and everything was fine, it even showed some growth. It happened so quickly that I wouldn't say it's because of the light - but that's just my assumption.
 
If your combo chips do not have anything below 455nm in them I can guarantee that its the lights. I say this because I dealt with this same issue over and over until I went full spectrum...

Even this article shows a study where under rb/cw led combos they had a 100% loss rate for every pocillipora specimen in their controlled environment:

http://www.advancedaquarist.com/2013/2/aafeature

But like I said, if you do have the light you need...then maybe look at the alkalinity? These are the two issues I had with RTN for this coral.
 
what kind of light do you have?

If you are using leds with just royal blue and cool white, that is your problem.

This is such BS. I grew 3 large birdsnest colonies from tiny 1/2" frags to grapefruit sized colonies in a year under blue and white:wavehand:



I agree looks like a sting to something picking at it......
 
You should try reading it. I am an led user and supporter...I'm just trying to help this guy figure out the problem.

From the article:
Pocillopora damicornis

Growth of P. damicornis was highly variable, and varied from -0.004 to 0.005 day-1 (or -0.4 to 0.5% day-1). The survival rate was 50%; all corals under LED died after several months.

The leds they used in the study were only a 1:1 rb:cw combo with no wavelengths below 455nm, unlike the lep and most other lighting solutions.
 
You should try reading it.

I did read it. But apparently you didn't.
From the article:

Pocillopora damicornis showed negative growth rates under all LED treatments, which was a result of tissue necrosis. It is unclear why this occurred, but it may have been due to limiting water flow rate. As only moderate water flow rates were measured in the systems (below 10 cm s-1), an accumulation of photosynthetic oxygen and heat within the tissue may have resulted in mortality
 
Yes I read this, but I disagreed with it based on my own similar experiences, and resolved the issues with actinic led supplementation. Water flow remained the same before and after, and mortality issues were resolved after the supplementation. I went from having sporadic success to permanent success going on two years now.

But it's fine, you do what you need to do. You're the one losing corals, not me.
 
Imo something is eating or stinging it..

I agree it being hogwash about the leds causing it.. That's one persons interpretation of what went wrong in his tank.. The majority says different.. Color loss and slow growth with a 1:1 maybe but not always..
 
Yes I read this, but I disagreed with it based on my own similar experiences
So you read a scientific study financed by the Dutch Ministry of Infrastructure and the Environment and you disagree? Very scientific from your part... :debi:

You're the one losing corals, not me.
Actually, I'm not losing corals, that's why I was asking for help, as everything else seems to be fine. I didn't even lose this one coral, it's doing fine apart form this one white patch. Other coral are just fine, including other SPS.
 
Imo something is eating or stinging it..

I agree it being hogwash about the leds causing it.. That's one persons interpretation of what went wrong in his tank.. The majority says different.. Color loss and slow growth with a 1:1 maybe but not always..

Probably what you say above. I've seen no change since then - the white "patch" remains white, but the coral is otherwise okay and polip extension is great. The colour remains the same throughout. I'm now debating if to frag or not, but if it continues doing this well, I might even leave it as is.
 
So you read a scientific study financed by the Dutch Ministry of Infrastructure and the Environment and you disagree? Very scientific from your part...

It is unclear why this occurred, but it may have been due to limiting water flow rate.

No, they were unclear why it happened...they didn't say either way. I used their information to determine a solution for my similar issue.

Maybe I should do a study on this myself.

Your hostility towards my suggestions, rather than just a polite thanks but not thanks is beyond imaginable, and is why people don't help anyone around here anymore.
 
Your hostility towards my suggestions, rather than just a polite thanks but not thanks is beyond imaginable, and is why people don't help anyone around here anymore.

Talking about hostility:

Then please, by all means, forward your stunning success to the people who did this study at advanced aquarist...they must be missing something then.

Yes I read this, but I disagreed with it based on my own similar experience

You're the one losing corals, not me.

So you post the link to that study... Then it turns out you actually disagree with the study. Then at the end you don't care anyway as it's not you losing your coral, it's someone else...?
 
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