Delayed Death linked to cyanide capture or something else?

[Wyvern]

Well, first death in 3 month old reef.

I bought a conditioned Exquisite fairy wrasse about 3 months ago as the second addition to the tank.

He ate fine, pooped fine, never flashed, never breathed heavy or twitched and was very alert.

This morning he was just laying on the bottom dead getting eaten by the CUC. He had one foggy eye so thinking it was already getting eaten, or possibly he smashed his head.

All fish added were quarantined, last addition added a month and a half ago and everybody is doing fine.

Nitrates 20 (yes a little high)
Nitrites 0
Ammonia 0
Salinity 1.025 (recalibrated)
Phos. <.1
PH 8.0
Temp 77F (verified)
ORP 300

Dinos are present (but not plague like)

I guess my question is, does it happen that cyanide poisoning or possibly medication kills months down the road? The only thing I dose my tank with is H202 and at small amounts (1ml to 9 gallons half at a time). And I have tons of carbon and UV to keep it from accumulating.

Obviously I'm keeping close tabs on everyone, but I always do anyway.

Thanks in advance.

 

[blaxsun]

Wrasse can be finicky fish. I measure their lifespan in days and months (not years).

 

[Wyvern]

Wrasse can be finicky fish. I measure their lifespan in days and months (not years).

Still, it's hard to accept sudden death.

I really hope that is all it is because I have an expensive, quarantined one-spot rabbit coming in a couple days and would be gutted if something is amiss.

All fish currently fine, flashers now duking it out for their fallen brother.


The more I read about Cyanide, the more I think that's the cause- it causes fish to die easily due to damaged circulatory system.

 

[Wyvern]

A couple weeks before his death

 

[JGT]

You’ll see on here, lotsa deaths that have no cause or explanation. Sometimes, fish just die.

 

[Wyvern]

You’ll see on here, lotsa deaths that have no cause or explanation. Sometimes, fish just die.

Hopefully it was just a $100 rental, not a plague waiting to happen.