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Old 01/12/2019, 02:44 PM   #1
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stancfii's Avatar
Join Date: Jan 2005
Location: Birmingham, AL
Posts: 584
Help with random STN of SPS

Iíve been pulling my hair out trying to figure out the root cause of STN Iíve been fighting since the summer. Alkalinity is stable at 8.0, calcium at 400, Mg 1360, nitrates may be detectable at 1 on occasion using Red Sea, phosphate 2ppb with Hanna ULR. Some SPS frags and colonies continue to grow at a slow rate, while others keep fighting STN... and they are in the same places theyíve always been. Iíve changed all RO filters, heater (it was old), new circulation pumps, test kits, everything I can think of other than my return pump (eheim) and skimmer pump (jebao). I dose ALK via Randyís recipe via BRS dosing pump, and Ca is Reef Fusion that I dose once or twice a week as I test for it. Prices like my green slimer go bottom up, but I have a red dragon that has started going top down. My only thoughts are bad salt or too many trace elements since the reef fusion has several in it. I switched to Reef Crystals earlier last year which may have been around the time this started, but I canít really remember. Before that I was using Fritz RPM and everything was growing well and colors were great, but not convinced the salt is the issue since some of the finest tanks Iíve seen use RC. Should I try a Triton test?? Lights are 3 Radiums and 2 VHO actinic, tank is standard 180. I run carbon through a reactor and rowaphos passively.

Thanks for the input.

180g SPS -3 x 250w Radiums, 2 x VHO actinic, DIY RB LED strip, and a EuroReef skimmer modded with a DC pump.
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Old 01/20/2019, 04:58 PM   #2
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Join Date: Apr 2003
Location: Mtl. Canada
Posts: 8,001
I’d suggest raising nutrients a touch.
They are very low..
Could be the trace elements in the Fusion but they are usually in a concentration that is based on ca consumption so as long as ca isn’t high, trace elements added via Fusion shouldn’t be either.... theoretically speaking anyways!
Icp test wouldn’t hurt..
so you don’t add any aminos or anything else?


Current Tank Info: 53x32.5x26 190g dt 60g of sumps 3 tank-100 gal frag system 6xAI prime 8xt5. 4x maxspect gyre. Skimz Dual internal sicce pump skimmer Deltec PF601s ca rx+Kalk stirrer
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Old 01/21/2019, 12:00 PM   #3
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Join Date: Aug 2011
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po4 is to low and alk ist to high for ULN

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Old 01/21/2019, 12:05 PM   #4
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Join Date: Sep 2004
Location: Minnesota
Posts: 1,867
rtn/stn from top down with all para in check
can be a sign of overdose on trace elements.

Dont let me know where u lived if u have a nice pair of clownfish in ur tank!^_^
Clown kidnaper^_^

Current Tank Info: 300DD, SM200/RD3,ATI 60-8X80+4X75, 2 Sea Sweep & 4X6105 & 6208
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Old 01/21/2019, 12:22 PM   #5
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Originally Posted by Reiser View Post
po4 is to low and alk ist to high for ULN
with 0,02 po4 you dont need rowaphos. I have the same Problems with my Echinatas, Red Dragon und some deep Water Acros. The other SPS have no problems. The colour is most pale and not so clear with to low po4 at all SPS in my tank.

when i start dosing to much po4, change water, dose NO3, then i get more STN. because it was to much stress. Now I dose 1ml po4 per day on 1400l
Nitrates is 1 and po4 is 0,04

Skimmer not to wet

My Corals dont like carbon in an reactor. They have no polype expansion and my monti Reverse Sunset was grey with orange polyps when i have carbon in an Reactor.

iodine and strontium are important for stressed corals

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