angelfish help

[SeanTrollope]

i dont intend to get another angel fish. yes this was a breeding pair.

no i did not add anything to the tank other than previously mentioned. i checked to see if there were any dead fish but there weren't. it has no come down to 0 as i have already mentioned and it is staying there.

 

[SeanTrollope]

right so i just realized that the night of the morning that he died we had a power outage due to a storm. it was a few hours long. would this cause a NO2 spike

 

[Byron]

right so i just realized that the night of the morning that he died we had a power outage due to a storm. it was a few hours long. would this cause a NO2 spike

It shouldn't. This tank I am assuming has been running for some time (five years was mentioned, not sure if that applies to the tank itself or just the angelfish pair). Nitrifying bacteria will colonize the substrate as well as filter media. Provided the tank is biologically in balance, turning off the filter should not cause issues, ever. It is when we overload an aquarium that losing the filter can be disastrous and deadly to fish. Water movement factors in in such cases too, and other things.

I have only once in 20+ years seen nitrite above zero, and that I believe was due to an antibiotic I had used that killed most of the nityrifying bacteria along with what was being targeted.

 

[SeanTrollope]

this particular tank has been running for a year also but the filter i had in it up to about two weeks ago has been running for the last 4 years. i did transfer as much of the filter media as possible and i did make sure the tank was stable (backup tank running just in case) before adding the new fish.