GHA killing corals

SOGavity

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I know this has been talked about a lot and I've even asked questions about it, but I find myself again dealing with it, and I'm super frustrated. Last time this happened, I gave up fighting and took every rock out of my tank and scrubbed them clean. It worked for about 3 months. Back then, the tank was over a year old. Now it's about a year and a half old.

I have a 90 gallon display tank and a 30 gallon sump underneath it. I have a Bubble Mangus protein skimmer. I have two powerheads (a new crossbar one is on the way), I change my filter socks twice a week, and do a 15 gallon water change once a week (once a month, I empty the sump and scrub it and count that as one of the water changes). I use RO/DI water. I use Red Sea Coral Pro salt. I dose Alkalinity, amino acids, trace elements, reef roids (I have gonipora), live phytoplankton, and run my chaeto refugium lights on an opposite schedule to my display lights (display lights run for 12hours a day). I also have a CO2 scrubber attached to my protein skimmer. I was feeding frozen foods to the fish and corals, but have since switched to flaked food, hoping it would help.

I have a tudexo urchin, turbo snails, astrea snails, conches, and a few others. I also have a convict tang, tomini tang, and bi-colored foxface (All currently around 3") I have also tried emerald crabs, but they die within a week. What am I doing wrong? The fish and snails don't seem to touch the stuff, and it's currently suffocating my zoas, candy cane corals, one flowerpot coral, discoma, and GSP.

Salinity 1.025
Alkalinity 8
pH 8.4
Ammonia 0
Nitrites (untested)
Nitrates 7
Phosphates 0.055
Calcium 420
Magnesium 1440
 

TX_REEF

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your parameters look perfectly fine. "all crabs die within a week" is suspect to me, have you considered an ICP test to get a detailed analysis of potential water quality issues? I have used this kit with success multiple times in the past: https://amzn.to/3H2Goti
 

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