sps mortality

Willylumplump

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I have had my current tank up for nearly 3 years, and have been unable to keep sps. My lps and softies grow extremely slow, however, have never lost or killed any. All my sps usually lose color after 2 weeks, won't grow, then tissue starts dying off after a couple months.
I know I had been over filtering the water in the past, and looking for help on how to fix my problem.
The main tank is a 180, plumbed to basement, 100gal Rubbermaid, half full of base rock, holds 40 gal water, 30gal tank, which was meant for fragging at some point, and 56 gal refugium, that houses a 8 in sand bed, and caulerpa.
I use a deltec tc2060 skimmer, 2 cups carbon refreshed every 2-3 weeks. I perform weekly water changes of 15 gallons with aquaforest reef salt.
I use a autofeeder the feeds pellets 3 times a day, and feed at least once, if not twice mysis/brine.
I purchased a seneye to adjust my lighting, which is 8 bulb t5, 2 actinics, 3 blue+, 3 coral +, hanging 6 inches off the water. par seems to run 200 to 400 bottom to top.
I had always tested for alk,cal,mag,phos,nitrate. all fine, have ph and orp meter are also fine.
I had never detected nitrate with red sea, and my phosphate usually reads 0, ocassional .09 on hanna.
A few months ago, I purchased 3 sps to test the waters again, and hooked up acropower to one of my dosing pumps to see if would help, and all I got was a little more bubble algae. The corals colors faded. Still alive, but grayed out.
I recently ran a triton test, hoping would turn up something that I was not testing for. I will post below in hopes someone has any ideas.
The only major deficiency was potassium, which I corrected. I went on vaction, when I returned, I could definitely tell some of the color had returned to the sps.
Could the potassium deficiency be the root cause of the mortality in my sps?
I could be starving the corals, however, I feel as if I am feeding the tank enough, and rather not have to clean more. I have kole, yellow, blue tang, rabbitfish, angel, wrasse, 2 anthias,2 clowns, 2 chromis, i think is stocked well enough, and have been in long enough, would kill anything else introduced anyhow. the tangs drop turds big enough vacuuming cant even get out. Should I remove some of my dsb in my refugium? skim even drier?
If you read through all of that, thank you, and would appreciate any suggestions.
again, softies, lps, fish, inverts are fine, clownfish even spawn every few weeks.
triton

test below:
 

Attachments

As you note, the potassium is (or was) quite low (below 300 ppm), perhaps low enough to be the issue.

Raising salinity to 35 ppt will help that some, but you'll need to dose to bring it to NSW levels (if accurate and if it is still low).

Nutrients, such as nitrate, may be too low and the corals may be starving. Trying to dose nitrate is easy.
 
Within that analysis i miss at least 3 major parameters (or did i just oversee it?)
- salinity
- Alkalinity
- Nitrates

all of this three are mandatory to be at good levels or at least "quite stable" to keep SPS
 
I have had my current tank up for nearly 3 years, and have been unable to keep sps. My lps and softies grow extremely slow, however, have never lost or killed any. All my sps usually lose color after 2 weeks, won't grow, then tissue starts dying off after a couple months.
I know I had been over filtering the water in the past, and looking for help on how to fix my problem.
The main tank is a 180, plumbed to basement, 100gal Rubbermaid, half full of base rock, holds 40 gal water, 30gal tank, which was meant for fragging at some point, and 56 gal refugium, that houses a 8 in sand bed, and caulerpa.
I use a deltec tc2060 skimmer, 2 cups carbon refreshed every 2-3 weeks. I perform weekly water changes of 15 gallons with aquaforest reef salt.
I use a autofeeder the feeds pellets 3 times a day, and feed at least once, if not twice mysis/brine.
I purchased a seneye to adjust my lighting, which is 8 bulb t5, 2 actinics, 3 blue+, 3 coral +, hanging 6 inches off the water. par seems to run 200 to 400 bottom to top.
I had always tested for alk,cal,mag,phos,nitrate. all fine, have ph and orp meter are also fine.
I had never detected nitrate with red sea, and my phosphate usually reads 0, ocassional .09 on hanna.
A few months ago, I purchased 3 sps to test the waters again, and hooked up acropower to one of my dosing pumps to see if would help, and all I got was a little more bubble algae. The corals colors faded. Still alive, but grayed out.
I recently ran a triton test, hoping would turn up something that I was not testing for. I will post below in hopes someone has any ideas.
The only major deficiency was potassium, which I corrected. I went on vaction, when I returned, I could definitely tell some of the color had returned to the sps.
Could the potassium deficiency be the root cause of the mortality in my sps?
I could be starving the corals, however, I feel as if I am feeding the tank enough, and rather not have to clean more. I have kole, yellow, blue tang, rabbitfish, angel, wrasse, 2 anthias,2 clowns, 2 chromis, i think is stocked well enough, and have been in long enough, would kill anything else introduced anyhow. the tangs drop turds big enough vacuuming cant even get out. Should I remove some of my dsb in my refugium? skim even drier?
If you read through all of that, thank you, and would appreciate any suggestions.
again, softies, lps, fish, inverts are fine, clownfish even spawn every few weeks.
triton

test below:

My non expert guess from all my reading is your N03. I think you stated and suspect this yourself. You could try to skim dryer or you could dose some n03 to get it up to detectible levels. I had to, and continue to do this also. You don't mention any carbon dosing, so I assume you're not doing that.
 
The salinity is noted in the triton test as Na. I recalibrated the refractometer and found it off. I thought was at 1.026, however was at 1.024.
My alk is solid at 8 to 8.2. I test weekly at this point. It's dialed in by 2 part, and not much changing in the tank
Nitrates always have been undetectable by red sea test kit.
I had posted to other boards and all I have ever gotten was feed your fish more. As stated above, I don't think that's the problem. I thought maybe reducing filtration, maybe some of the dsb, or the macroalgae.
I had always attributed the loss of color to nutrients, and had never tested or supplemented potassium, but I had never seen anyone attribute death of corals to those, and rather loss of color.
Same with the nitrates, which is another reason I tried aminos.
I can easily remove the aminos from doser, as it is almost done anyhow, and didn't seem to have much effect, and replace it with nitrates.
thank you for your replies, I am at my wits end
 

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