No I haven't used the malaseb shampoo yet.
Other observations are: They eat pellets and hay normally, I would say that their appetite is increased the last month, because they almost eat all they hay I give every day, they used to leave some more a month ago. They also seem to drink more water too. Their droppings are quite normal, but not perfect. Maybe is the treatment (ITRADROPS). What I mean is that their dropping don't have the same size every day, one day are normal length, another are bigger and some of them are rough, and all this happens the last two weeks.
I suspect, that its something more than a fungus, but I don't really know what. I have searched the internet so much, but I can't find something that is completely similar to my case. For sure is an infection, I will tell the vet to do exams if he can (he doesn't know about chinchillas), to two at least chins, like blood, or feces cultivation.
About the oral treatment I am doing 6 days now (ITRADROPS). I stopped the sand with the powder for fungus. How many days you think it takes to show results?
Thanks!