What would cause all the fish to die with in hours?

[Angelodr2]

Hi guys am having a bad day with my tank, a few days ago, early I the morning I check my tank and and 4 of my fish are dead I check the water and it seams good. Today early morning I see a few more dead fish. Has anyone encounter this problem before? There is nothing other than fish and corals in the tank.


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[HERPER]

did you happen to use petco's saltwater? I bought some of that a few weeks ago and it killed a fish and nearly killed the rest. all the normal parameters seemed ok but i swear something was up with the water.

did a few water changes and everything but one bounced back.

 

[Archit]

what are you using for your water for water changes and top off? a lot of cities are doing their "water pipe flushing" now a days ... so that might have caused it if nothing else has changed ...

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[Angelodr2]

I used a 5 stage rodi nothing from petco


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[jah-hoeva]

Could be velvet if it killed real quick. Any new fish or corals in the last week or 2?

 

[Tanked_Life]

velvet killed my midas blenny in 3 hours... It tricky because if you don't know what to look for, a fish infected by it will look normal and healthy until it dies really.

 

[IPWitan]

chlorine will kill very quickly and then dissipate. I know of an incident where a disgruntled employee dropped a cup of bleach into a tank at a Petsmart. It killed all the fish in the entire system in about an hour.

If you figure it out, please post what happened.

 

[aresangel]

Sorry to hear about your crash. Are the corals ok? If so I would tend to agree with a fast acting fish killer, or if your tank is enclosed maybe too low dissolved oxygen?


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[nemodan]

2 times , in a small tank I did the same mistake. Went over the limit of stress by adding more fish. In less than 36 hours all fish were dead. They immediately developed what I believe was velvet.

Are your corals OK ? Other Inverts (snails etc) ?

Did you added extra fish during the last days ?

 

[choff]

How about temp or pH spikes? Any pesticides get sprayed in the area? Some areas do over head spraying.

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[Angelodr2]

All the water parameters are good I did add about 5 fish with in a month and a half. Also I have three in the sump and they seem good my corals are good too. So I think it was a decease from one of the fish that I got.


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[jah-hoeva]

Sounds like it. My money is still on velvet.

 

[cilyjr]

Oxygen depletion will cause a fast die off

 

[IPWitan]

re oxygen depletion, is that even possible if you have a protein skimmer and no bacterial bloom?

 

[cilyjr]

Maybe with Skimmer if sump turn over is low and only a small powerheads in the Dt

 

[Angelodr2]

I have a mp40 and a rw15 both at half the speed and the skimmer is working just fine. I have 4 fish left one die two days ago, now the ones i have in my sump are just fine


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[cilyjr]

Not likely oxygen depletion then.

 

[frank180reef]

Velvet, how long d did it take to after you got your last fish

 

[Angelodr2]

About 4 days


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[Angelodr2]

But now I have 4 fish that are doing well, it's been 6 days since the last fish die


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