Corals die almost immediately in my tank

Luminocity

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Not sure if this is the appropriate place to post this but I guess I'll have a go at it.

I've looked everywhere for a possible definitive solution to my problem but I can't seem to find anything. My 50 gallon tank with a 20 gallon sump that has been running for 6 months now has never been able to keep corals. Most people online I see have success with corals for at least a couple of months before things go south, but my corals (aside from one GPS frag) never make it past the 24 hour mark without receding into basically just skeleton and left over flesh.

My paramaters are Ammonia: 0 Nitrites: 0 Nitrates: 5-10 Salinity: 1.025 Temp: 78F pH: 8 Alk: 7.8 Phosphorus: 0ppb (Highest I've had was 7ppb) Calcium: 450ppm Mag: 1350ppm

It is currently stocked with 2 Ocellaris Clowns, 1 Firefish goby, and 1 Pink spotted goby.

I use Red Sea Coral Pro salt for my water changes and I have an ATO providing RODI water.

I have an MP10 and a Maxspect gyre XF330, MP10 on Nutrient transfer mode and the gyre on pulse mode.

I used about 40 pounds of life rock and 25 pounds of crushed coral for the substrate.

I have a reef octopus skimmer in the sump and 2 heaters in there as well.

The tank is 36" by 18" by 19", im running a single Kessil a360we on a higher intensity since I know the kessil doesnt cover my entire tank itself which is why I have another one coming in the mail.

Now aside from my lighting maybe not being strong enough the only other thing I could think of is maybe there are metals in my water that I'm unaware of.

Basically how it goes is I either go to my local LFS or I order corals to my house and they always come alive in the mail since its only about a day of travel, and when they are floating in the tank they seem to be happy and even sometimes open up a little bit, but the second I go through the drip acclimation and the dipping process and finally add them in they seem to receed and never come back out.

None of my corals have ever bleached, they always seem to brown out or just deteriorate, which is why I have my lights intensity so high, I figured they might not be getting enough.

On top of that I have also never been able to keep a shrimp in my tank for longer than 24 hours, I've tried every type of acclimation process, drip, leaving the bag on the waters surface and scooping water in slowly, then getting rid of half and going again.

Nothing seems to work.

I have no issues keeping fish but inverts and corals just don't live and I have no idea why.
 
Have you double checked that whatever you are measuring salinity with is properly calibrated? There was someone having a similar issue not too long ago and it wound up being a problem with his refractometer reading. When he figured it out he realized that his salinity was up over 1.030

He was literally having the same issue with both coral and shrimp.
 
Perhaps its the drip acclimation, I always just float for 15 minutes and chunk them in. Got any pictures of your tank? Something might stick out to us.
 
Describe your dipping process
 
Have you double checked that whatever you are measuring salinity with is properly calibrated? There was someone having a similar issue not too long ago and it wound up being a problem with his refractometer reading. When he figured it out he realized that his salinity was up over 1.030

He was literally having the same issue with both coral and shrimp.

I want to thank you, the calibration was way off, now I have to slowly raise my salinity back up. Thank you so much!
 
I was wondering how your alk was so low while using Red Sea coral pro haha, very low salinity makes perfect sense.
 
Sounds like copper in your water. Get a test kit and check

I agree with this, I am novice to coral but shrimp dying sure sounds like copper. Is any of your equipment used? Used rock anything that could be leaching out toxin? Definitely test copper. RO should remove metals. If you are on city water there should not be any weird toxins. It has to be something in the water. If you do test positive for copper look into one of those send out water tests, make sure it includes toxins or call the company ahead of time to make sure they know what you are worried about and can test for it. I do not think coral would die that fast in no light or in anything less intense than a laser.
 
Have you ever checked the PAR of your light - you said you keep them 'high'?
Do you have other inverts that are doing ok? (if not could there be copper or something else in your water)?
What is the flow like in your tank? (I tend to favor higher flow)
Have you checked the parameters from your LFS - or where you bought your corals - to see a difference?
Do you use RODI water - or something else?
How often are you changing water? I may be wrong - but the salt you are using is a more high alk salt - I might suggest one that is a bit less (again I may be wrong here) - I am just saying use a salt for changes that mimics what you want to avoid swings.
THE SHRIMP SUGGESTS A TOXIN
 
I agree with this, I am novice to coral but shrimp dying sure sounds like copper. Is any of your equipment used? Used rock anything that could be leaching out toxin? Definitely test copper. RO should remove metals. If you are on city water there should not be any weird toxins. It has to be something in the water. If you do test positive for copper look into one of those send out water tests, make sure it includes toxins or call the company ahead of time to make sure they know what you are worried about and can test for it. I do not think coral would die that fast in no light or in anything less intense than a laser.
Never mind, I saw the SG calibration issue.
 
Before I read any of the replies my first thought was salinity because it happened to me. Fish were fine at least to the eye but coral would reseed and just die. My brand new refractometer and calibration fluid we’re giving me incorrect info.
 

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