Fish Dying All Of A Sudden

[LoachLover!]

I was away for a week, and during that time, I had the fish being fed measured amounts of food.

This is a stable, cycled tank.

While I was away, I lost 5 platy fry, an otto and today I lost an apparently healthy adult platy (I appear also to have lost an adult zebra loach as well )

I am really put out by it as it was perfectly stable beforehand.

However, I have noticed stringy poop, which suggests parasites?

I will be getting water tested today, but I don't think it's the params that are the issue.

Should I treat for parasites, or should I just do a "General Tonic"?

Thanks in advance

 

[N0body Of The Goat]

While the water stats might be interesting, I would just put some tank water to one side and do a massive (75-95%, higher the better) water change anyway after fish deaths.


Maybe the fish sitter decided your portions were too small, added more and then turned the tank into toxic soup?

 

[LoachLover!]

Thanks for the reply. I did do a 50% PWC. I thought doing it too big could cause problems?

I tested the water and it is 100% fine - nothing that should cause fish deaths.

No, they didn't change my portion sizes. I trust them not to. And, seeing as the water params are fine, I guess that suggests that that is unlikely?

Turns out, the zebra loach I thought had died, hadn't. I found him this morning. He was lying on his side. I assumed he was dead, but being a loach, I thought maybe he was playing dead. He was still alive and darted away. I didn't think anything of it. Then, this afternoon, I checked the tank and there he was - dead. He had a big tummy, but I don't think that caused it as they are super greedy!

It is so frustrating! I just hope I don't lose any more!

 

[LoachLover!]

I appear to have lost another adult platy today. At least, I cannot see her ANYWHERE