I am going to be long winded on this post. I just want to document the mistakes I have made but also document what I’ve learned through this process as well as the supporting documentation I’ve found in my research.
My current delimma is a complete loss of 40% of my SPS coral by my own hand. Since the beginning of setting up my system, I have always had ultra low nutrients. This will come into play later. Things were always growing good and I didn’t have many problems. Other than my pH experiment that caused my magnesium to drop extremely low. But that was quickly corrected. In October I changed my lighting spectrum to the AB+ Settings that are recommended by AquaIlluminations and Radion for maximum growth and color. I ran that spectrum for a month, up to November 20th. Looking back at pictures, I was having great coloration and can’t believe that I felt I could get even more color. At that time, my royal blue and blue lights were only running at 90%. I read an article saying that blue light would increase color at the end of the light cycle. So, I decided to back off the UV and violet light in favor of bumping the blues up by about 15-20%. This was a huge mistake. It damaged most of the SPS. Exactly what occurred within the coral, I do not know, but they started dying. While this was happening, I started feeding reef roids daily to try to get the corals to pull through. I was not diligent in testing phosphate and nitrate while doing this. This created a new problem in the form of excess nutrients. The PO4 skyrocketed to .25 and nitrate was up to 30-40. I learned that since the lighting mistake damaged the Corals and they started dying, not only did calcification stop, but nutrient consumption stopped as well.
What I was observing was a complete halt in growth of the Corals and the flesh was just falling off. I quit adding the reef roids and started doing water changes. At the time, I didn’t know exactly what level of PO4 was acceptable. I could not get the PO4 under .2 consistently. So, I added some caulerpa to the sump, once again. In the last few days I have been searching and searching for answers as to what is hindering coral flesh growth. I have been monitoring a sunset Monti thru this. This particular coral is trying to grow and spread but shortly after it encrusts, it starts turning dark and retracting polyps. Much like the other Corals that have died.
Well, Thursday I found what I think is the answer, through an article by Randy Holmes Farley about phosphate and it’s affects on reef aquaria.
http://reefkeeping.com/issues/2006-09/rhf/index.phpIn this article, I finally found an answer as well as a number. In the article, RHF says that research on the Great Barrier Reef has shown that a PO4 level of .19 for as little as 3 hours a day inhibits coral calcification by 43% in pocollipora and acropora species. It does not, however, say what the level is to cause a coral to stop calcification completely. But, I am taking .19 as that number for future reference.
The other (side note) thing I learned from the RHF article is that PO4 will bind to precipitating calcium. Exporting PO4 in the process. This would explain why I could never get a PO4 reading on the Hanna while I was having the Ca precipitate, due to my high pH experiment.
My testing yesterday was
1.026
9.23 alk-hanna
419-Ca- Red Sea
1410-Mg-Salifert
30-40 NO3-API
.06-PO4-Hanna
Over the last week I have incrimentally changed the lighting back to AB+. I have not seen any change to the corals yet, but I am optimistic that I have hopefully stumbled onto my answer to getting this sinking ship righted.
All I can say is when it rains, it pours. So many things in this hobby are closely related and when you disturb one thing, it may affect 2 or 3 other things. I’ve learned my costly lesson and I am going to do my best to quit tinkering lol.
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Topic: Downhill spiral - lights, PO4, dead corals (Read 4488 times)