Guppy skinny disease

[NStalgia]

So I think a guy just sold me infected guppies. A few of them were separated from his main tanks and had them in his backyard. I started noticing them getting skinnier amd they weren't really big to begin with even tho they were female and now slowly dying off. I'd be fine if the guppies had a weak strain but now he just infected my whole tank.
So I'm wondering if filling half the tank a couple times with boiling water will kill all the parasites? Or is it fine with a certain temp or do I have to fill the whole tank? Only stuff I have there are plastic plants, soil substrate and lava rocks.

 

[Aiken Drum]

How do you know the whole tank is infected? Are fish that where healthy before you added these guppies now dying?

 

[NStalgia]

Only the fish that I bought from that guy. Now there's only 1 of them left. My other fish seem ok. There's a couple guppies, a pair of minnows, a balloon molly, some nerites and apple snails and a cory. I've got a lot of guppy fry that I'll be adding into that tank as soon as they get bigger that's why I wanna make sure. Also should I assume that the minnows and cory could be infected now? I was planning on transferring them to a different tank but now I'm worried they might infect my other tanks. I've transferred them all to a temporary quarantine tank for now while I'm planning on how to treat their tank. I might be able to find some Fenbendazole tomorrow and try to treat the last remaining sick guppy.

 

[NStalgia]

How do you know the whole tank is infected? Are fish that where healthy before you added these guppies now dying?

Can snails carry and transfer those btw?

 

[Aiken Drum]

Depends what the infection actually is. They can certainly carry parasites, especially if they have been transferred from an outside pond into an aquariun.

 

[NStalgia]

They carry the skinny disease from the infected guppies? Cause so far those guppies are the only ones that got sick.

 

[Aiken Drum]

I think what you are referring is a parasitic worm infection, so yes, snails can carry worms.