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#1
08-16-2011, 03:44 PM
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I've had this happen in the past and I later discovered it was caused by a dying birdsnest colony. As soon as I took the birdsnest out of the tank everything stopped dying. I suspect you may have something similar. As soon as you seer a colony start to go, cut your losses and rescue the healthy parts of the colony, if any, and toss the rest. Who knows what caused the die off in the first place.
Alk is high. While it's not catastrophically high, I've had mine this high before and found the colonies to be more susceptible to weird things... In fact I suspect high alk was the cause of my birdsnest collapsing that triggered everything else. 
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#3
08-16-2011, 04:17 PM
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Just re-read your OP...... how many leathers are we talking about?? And how big are they?
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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#5
08-16-2011, 08:14 PM
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I never liked mixing any leather with sps, they do release toxin into the water which can trigger rtn. dkh seems to be okay if you are not on any probiotic system, if in any case you are or just started running pellets or zeovit then that could be a major part of your problem.
Also take a sample of your water to the lfs and get them to check your cal, dkh, and mag just to get a extra set of reading. This way there will be no mistakes on you readings. Frag what ever is alive and tossed the rest, I have very little luck try to save dying sps colonies, but with that said I have done it before. sorry for the lost, good luck.
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Though a tree grow ever so high, the falling leaves return to the root. 300DD - 140DD  TOTM Fall 2013
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#6
08-16-2011, 09:37 PM
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#7
08-16-2011, 09:59 PM
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Brad
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#8
08-16-2011, 11:52 PM
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probiotic systems like biopellet or zeovit needs to run the parameter close to nsw which is 7dkh 380-400 cal and 1250-1350 mag. in my own experience as well as several other reefers I talked to who run probiotic systems wether its pellets, zeo or prodibio has encounter issue when dkh jumps above 9, usually alk burn will start to show at the tips and or paleness of the coral tissue, then if dkh goes above 10 stn and rtn will soon follow. When that happens, it become an irreversible domino effect.
 Also when running probiotic system, the bacteria stripes potassium out of the water so fast, with the combination of high alk, it will for sure wreck havoc. I use redsea to test my potassium, when I first tested it, it was arond 360ppm since then I've raised it up to 430 using zeo k balance as I found that to be more effective than other products. Those 2 problems really caused me a lot of headachs in my tank, it caused 3-4 colonies that I had for over a year to die off over the course of couple of days. I did a lot of research finally narrowing it down to those 2 problems. I spent the next week or two lowering my alk and boosting my potassium, it took a bit but everything has finally starting to turn around. It seem that around 7dkh and 430 potassium, even if my calcium is lower everything still seems to be doing well. I had one colony that has been with me from the start that was at the brink of death, I just couldn;t bring myself to toss him out, its now starting to make a slow but steady come back. if I were you Milad I would give that a try, but remember to go slow. You risk more issues if you drop your alk too fast.
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Though a tree grow ever so high, the falling leaves return to the root. 300DD - 140DD TOTM Fall 2013
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#9
08-16-2011, 04:27 PM
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Hybrid Mode
