My fish are dead

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I was doing 2 gallon water changes every week

That likely wasn't enough. The issue with tangs in smaller tanks isn’t Just their size, but the amount of ammonia they “breathe” out from their gills. Like cows put off tons of methane, some fish put out more ammonia. ;)

I tend to lean towards the illness and ammonia spike theory. I got brook in my first tank and it set fish-less for nearly 3 months. It killed my first clown before I even knew anything was wrong. I also got ich after months of nothing. It can arise from
anywhere. When you have a smaller tank, there’s not a lot of room for error. It’s the reason several people on your thread said that people tend to stock your size tank heavily with corals but not fish. The size can stunt fish, but more immediately, it’s just harder to keep a safe environment for fish as you add more fish. Hopefully you stay around. Set backs are part of the hobby. You just got to expect it in your journey. Takes some grit m, but if you have it, it’s fun.
 
I don’t understand how they would die of ammonia if it wasn’t in the tank, also my legs uses copper in their systems
 
API and red sea

Which ones for which tests? API kits are notorious for being inaccurate, flat out not working.

On the LFS using copper - unfortunately that's meaningless. Most stores run a small amount of copper to mask signs of sickness (i.e. Ich) but not the required 5ppm for treatment. MY local store also runs copper, and I trusted them and brought Ich home after the fish was in their system for weeks. All it does is make a sick fish look healthy.
 
I don’t understand how they would die of ammonia if it wasn’t in the tank, also my legs uses copper in their systems

Ammonia comes from decaying material. The second something dies, it starts putting off ammonia. fish also put off ammonia from their gills.If one of your fish got sick, it likely started breathing more rapidly, putting out more ammonia. In a tank this small, that could have been enough to cause a death spiral. If one of the fish died quickly (which is likely), even if it was natural causes, it’s going to immediately start releasing ammonia, resulting in the other fishes death.
 
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