Help randomly lost all 7 fish

[Falcons070]

Good evening, I have a 60g tank and all have all stable parameters except phostate is slight elevated. I had 2 clowns, cardinal, 1 baby yellow tang that eventually I was going to re home, six line, and a long nose hawk fish. The tank has been up and running for 5 months and the 2 clowns I had from a previous nano for 3 years. I work as a firefighter and came home from a 48 hour shift to find everyone has died. I triple tested my water and everything was stable.

Only thing I can think of is a recently added new blue legged hermits and did not quarantine them.

Any insight on what could have possibly happened? All inverts and corals are still alive

 

[Idech]

#reefmedic #fishmedic

 

[Sharkbait19]

Bringing in hermits would likely not do anything unless they came from a heavily infected tank.
Any recent fish? Any chemicals that could have gotten in? Power outage?
Are inverts okay?

 

[Falcons070]

Bringing in hermits would likely not do anything unless they came from a heavily infected tank.
Any recent fish? Any chemicals that could have gotten in? Power outage?
Are inverts okay?

Bringing in hermits would likely not do anything unless they came from a heavily infected tank.
Any recent fish? Any chemicals that could have gotten in? Power outage?
Are inverts okay?

Thanks for the response, no power outage and no chemicals that I know of. All the inverts are doing well. I’m honestly so confused on how this could happen. I have good flow so o2 shouldn’t randomly become an issue

 

[Falcons070]

Thanks for the response, no power outage and no chemicals that I know of. All the inverts are doing well. I’m honestly so confused on how this could happen. I have good flow so o2 shouldn’t randomly become an issue

I did have an outbreak in Cyanobacteria and I kept the lights out for 2days and the day I came back all fish, were dead.

 

[Falcons070]

Water temperature was 76

 

[musel101]

@vetteguy53081

 

[Sharkbait19]

I did have an outbreak in Cyanobacteria and I kept the lights out for 2days and the day I came back all fish, were dead.

Is the cyano alive or did it die off? It’s possible the massive die off of algae kickstarted either a drop in o2 or ammonia spike.

 

[Falcons070]

Is the cyano alive or did it die off? It’s possible the massive die off of algae kickstarted either a drop in o2 or ammonia spike.

I did some research and doing the black out definitely did it. The massive die off of algae made the water toxic. I did a 60% water change and hopefully can get new fish soon. Thank you for your help

 

[Macbalacano]

I did some research and doing the black out definitely did it. The massive die off of algae made the water toxic. I did a 60% water change and hopefully can get new fish soon. Thank you for your help

I did not even know this was a possibility. Thank you for sharing and very sorry for your loss!

 

[Sharkbait19]

I’m sorry about that - I’ve had similar happen in one of my fw tanks. Thankfully I was there when fish started dying, but I still lost almost all of them.
To be safe, I’d still recommend a 60 day fallow period (in case of any disease issue) and qt all new fish.