Back From Vacation- Almost All Fish Dead!!

[Kustrud]

Update. 90% water change this AM, removed all dead fish, and then cleaned the tank. By cleaned I simply mean after the incident vacuumed what little there was and wiped the walls down which I do routinely any way. Now tonight, water is crystal clear, parameters obviously good, and all fish left are 100% perfect I can tell! I don’t get it!?!?

I’m at least happy I feel like it’s stable again quickly. Obviously will keep a close eye on everything next several days.

 

[ruincccc]

Update. 90% water change this AM, removed all dead fish, and then cleaned the tank. By cleaned I simply mean after the incident vacuumed what little there was and wiped the walls down which I do routinely any way. Now tonight, water is crystal clear, parameters obviously good, and all fish left are 100% perfect I can tell! I don’t get it!?!?

I’m at least happy I feel like it’s stable again quickly. Obviously will keep a close eye on everything next several days.

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Beautiful setup

 

[GrindeL89]

This is sad to hear sorry for your loss. What's curious to me is some the fish mentioned have a reputation for being rather hardy and based off the test you did with parameters I don't think it's water related. I'd guess
1. Disease
2. Possibly power outage but that would be a long period outage to kill off these fish.
3. Possible electrocution surge leaked from heater?

 

[Joshuakahan]

Bummer, sorry to hear it. It sounds like an Ammonia spike, but I don’t think that your test readings back that up. Did your buddy maybe top off the tank without using a dechlorinator?

 

[Kustrud]

I know, I thought all the things mentioned above. He did not pour anything in tank either.

Heater still in there and never had an issue with it. I don’t think the power went out per my neighbors, but even if it did I think with my setup that’d take an awful long time to kill the fish….but still, they told me it didn’t.

The fish left I just checked again this morning. 100% perfectly healthy. I’m so confused! Sucks about all of them but really disappointed for the GT and Featherfin that had come so far!

 

[SilverArowanaBoi]

This might be a little out of the box, but didn't you just put in some new decor? Perhaps there was something on or in the new decor that was harmful to your fish.

 

[Kustrud]

I did actually add a new/larger sponge filter. Everything else had been in there.

 

[SilverArowanaBoi]

I did actually add a new/larger sponge filter. Everything else had been in there.

Hmm, that should be a beneficial thing, not something that would kill your fish.

 

[Kustrud]

Agreed lol. Just saying, that was the only new thing in the tank.

I still think it was something to do with removing the FX4 and going back to two AC 110’s as this was a couple of days before the fish died. Maybe even just transferring the media messed my cycle up….but still I never had any trace of ammonia.

Chalking it up to a fluke I guess.

I’ve always been good about maintenance and nitrates have never once been higher than 20 when checking.