Help - Naso Tang died after regular cleaning

[Fernando Parra]

Hello Everyone,

I need your help to understand what might have happened in my tank this weekend.
So, I just had to clean my tank glass because some of the algae was getting in the way and the subtrate (sand). I didn't change any water this time but I swam a lot on the substrate leaving the water totally cloudy.
Ok, after the cleaning done, a few minutes later I realized that my naso tang was lying on the sand and after a few minutes he unfortunately died!
I did not understand what could have caused his death, only he died, my hepatus and my clown fish are super good.

Do you guys have any explanation or can you tell me what might have happened?

Thank you,
Fernando

 

[geridoc]

I'm always very careful about disturbing the substrate. A variety of toxins accumulate there, and you may have suspended some of them into the water. When I clean the substrate I do so at the same time as a water change, and actually vacuum the substrate so that none/little suspends into the water column. I can't explain why your naso was bothered, but the other fish are doing fine.