All my fish dead

[shootingstar_reef]

Did you clean anything? any chance soap got into the system?

 

[Idech]

Did you disturb the sand and if so, when was the last time you did it and how deep did you go ?

 

[Randy Holmes-Farley]

pH of 7.0 will kill the fish especially if it was a result of excess top off resulting in a rapid change in salinity along with excess CO2

I don't see it as being likely that the pH was 7 prior to the fish kill. It's also unlikely even afterwards.

 

[brandon429]

we also cannot rule out disease from skipping preps. adding anything wet is a known vector, biosecurity article by Jay. I would assume then for all five years, anything stocked didn't pass through fallow or qt at all?

if so, disease not only can't be ruled out it moves up to #1 most likely / solely going off today's trending where anything from the pet store is as dirty the dance floor at studio 54 in 1974 and when only fish are dying...

 

[HBtank]

we also cannot rule out disease from skipping preps. adding anything wet is a known vector, biosecurity article by Jay. I would assume then for all five years, anything stocked didn't pass through fallow or qt at all?

if so, disease not only can't be ruled out it moves up to #1 most likely / solely going off today's trending where anything from the pet store is as dirty the dance floor at studio 54 in 1974 and when only fish are dying...

Disease and all fish overnight? Unlikely.

O2 is the likely issue, How is the question.

 

[unchaotic]

Was that pH drop sudden or do you usually run low?

I woke up one day to the fish and inverts dead in a 15 gallon. I don't remember how low my pH had dropped but the real problem was a bacterial bloom using up all of the oxygen. Unlike my 60 gallon, the bloom didn't become visible until after it had killed the fish.

 

[Cell]

I would think O2 deficiency is one of the few things that would kill all fish overnight with no obvious symptoms but leave inverts and coral unaffected. I'm not sure if inverts are perhaps more resilient to low pH than fish though.