Fish emergency.

I'm not thinking copper. Copper will kill inverts pretty quickly, but most fish can tolerate a decent amount of copper (copper is used to treat ich). Since the fish died and the anemones lived it's not likely to be copper.
 
Rust wont do it, GFO is basically rust and we run that all the time.
Vinegar wont do it since we also literally dose that

Brass T might have been an issues but it's hard to tell without a copper test.

Did you use any buckets without washing them out? Maybe a bucket with car wash soap in it or something.

A mouse pad under the return probably wont do it unless it was one with a picture or something glued to the top. Did you recently add the mouse pad or has it always been there.

If you dropped 40 gallons of cold water into your tank without pre-heating it that will cause a pretty good temp swing. Anemones get ****ed at a 2 degree swing. If you swung your tank by 5 or so, it would cause noticeable issues but not crash the tank.

It really seems like a toxin leached into your tank some how.

This really goes to show that you shouldnt let yourself run out of things relating to your tank. No salt, carbon, etc.
 
Do you have any small kids or could someone have spray some smell-good spray over the tank? IME, my 6 year threw in Cheez-its for my fish to snack on. LOL!! I got home and had to go fishing for them.
 
to cleaning the tank out with vinegar a few weeks ago when it was not up and running yet.

This tank is only a few weeks old? How about the live rock? Was this an established system that was transferred, or was this just "cured" rock?
 
This tank is only a few weeks old? How about the live rock? Was this an established system that was transferred, or was this just "cured" rock?

Missed that statement. If that is the case then look no further for the cause. The tank probably cycled and wiped out everything.
 
Missed that statement. If that is the case then look no further for the cause. The tank probably cycled and wiped out everything.



This is my guess too temp would not kill fish that fast and at 84 it still is unlikely anything would die for a long time, reefs can get pretty hot in the wild. If the Rock is so new you have a fairly large stock list for a few weeks old so a cycle is likely to cause
 
Missed that statement. If that is the case then look no further for the cause. The tank probably cycled and wiped out everything.



That makes sense. He stated he had an ammonia reading of .5, which is definitely way too high. I think people were assuming it was that high because of the die off, and that could have contributed to it, but if it was too high to start with, then it could definitely have been the cause.
 
i looks like this tank has only been running since late march so it probably wasn't fully cycled. did you end up using all base rock or did you also use some live rock?

so sorry for your losses. :(
 
No the tank was new but it was a transfer from my 90 gallon. I added about 150lbs of ESTABLISHED rock from my tank and additionally 50 lbs of ESTABLISHED rock from a friends tank. I used new sand but the tank did not and would not have recycled.
 
Hmm. The established rock should be ok, but if it was out of the water too long it could have had a lot of die off that could cause another cycle.
 
What was the time frame for everything? When was the new tank filled, rocks transferred, other rocks transferred, fish, water change, etc.
 
just seen this thread and I had similar disaster, used some rocks that had been used years before and stored we boiled and rinsed before using and they leached out and killed the tank about 3weeks after set up. we now only use fresh live rock I don't even trust used rock from a working tank
 
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