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I have a 90 gal. reef tank which has been relatively stable for the past 7 years. As of last summer I had 5 fish all over 7 years old.
When my Foxface died last June I added a Coral Beauty but it died the first night. I noticed that my Yellow Damsels were attacking it so I removed them and gave them back to the LFS. I then bought an Orchid Dottyback and a Sleeper Goby. They looked fine when I put them in the tank but found them dead the next morning. It looked like my Clownfish was going after them so I removed it and gave it back to the LFS. I then bought 2 Banggai Cardinalfish and an Onyx Percola Clownfish. Again they looked fine the day I put them in the tank but all dead the next morning. I thought maybe my Sailfin Tang was going after them so I removed it and gave it back to the LFS. I now had no fish in the tank. I then bought a small Blue Hippo Tang and a Coral Beauty. The Tang lived but the Coral Beauty was dead the next morning. I then bought a Magenta Dottyback and Oscelaris Clownfish but they too died.
For some reason the Hippo Tang continues to thrive. Although I've been testing my water I took a sample into my LFS and they said there was nothing wrong with it. I had been vodka dosing 2ml a day and read that it could be taking oxygen out of the water so I stopped it and waited a month while doing 4 10% water changes. I then bought 2 Pajama Cardinals and they died within 2 days.
The fish I've bought came from 4 different LFS's. I've tried 3 different recommended ways of acclimating them. Only the Tang survives and is doing well.
At this point I am very frustrated, feel terrible for killing fish and at a total loss. Any advice would be greatly appreciated (including stop what your doing, tear down the tank and sell it).
Here are the details of my tank:
90 gallons (18” deep by 24” high by 48” long)
Live rock, live sand, coral and fish
Filtration:
Ruby 36 Elite Sump with sock filters
Refugium with Cheato macro algae, live rock and deep sand bed
Phosguard & Carbon Reactor – Dual with MJ1200 Pump
Red Reef Reefer Skimmer 300
Coralife Turbo-Twist 5x UV Sterilizer
Heater
Livestock:
Astraea and Turbo Snails
Asterina Starfish
Bristle worms
LPS, SPS, Soft corals and 2 Anemone (bubble, rock)
Chemical Dosing using Eshopp's Dosers:
Reef Fusion 1 - 8ml daily
Reef Fusion 2 - 7ml daily
Magnesium - 7ml daily
Iodine - 7ml daily
Lighting:
Fluval Marine LED
Ramp up from 8:00am to 10:00am, Ramp down from 6:00pm to 8:00pm
Water Changes:
12 gallons weekly using RO/DI water and Salinity Salt
Current Tested Water Parameters:
Gravity: 1.026
PH: 8.1
Calcium: 400ppm
Nitrate: 2ppm
Alkalinity: 148
Magnesium: 1350ppm
Phosphates: 0
Iodine: 0.01
 

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My guess would be that your deep sand bed is toxic. The fish you***8217;ve had in there long term can survive because they adapted as the sand bed went bad. I***8217;ve had this same thing happen and have been in the process of slowly removing my deep sand bed.
 
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