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

 

[lmforbis]

You might have released something nasty when you stirred up the sand.

 

[jay0705]

Agreed. With above. I have no idea how us stirring up the sand is so much worse then what sand sifters do but it is. Its why i like sand sifters in my tanks. Either snails or fish or both.