If you do indeed suspect myco, but don't have the funds for a vet, you can get Tetracycline antibiotic powder found in the fish section of any pet store.
You just have to mix it into their drinking water. Most vets will usually prescribe Baytril for rats, but Baytril isn't good for pregnant/nursing does or growing pups under 4 months of age. It will promote bone deformities.
Tetracycline is safe for all rats. (w/ or w/o myco)
I've had much success treating myco flare ups with this with no negative effects. And I have confirmed it's safety with some vets.
This is what I get:
It comes in packets of 10. Each packet contains 50mg of powder. One packet can be used on a 16qt water bottle. A box runs about $11 at my local pet store.
I brought in new blood into my small colony last fall. The new rats I brought in had myco and I didn't realize it at the time. And it spread to 80% of my rats. I treated them w/ Tetracycline powder and now they're all fine. I did have one death, but that was one of the new rats. He showed the same symptoms you're describing. The rest were just sneezy.
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