I didn't feel disrespect at all, and thank you for your suggestions.
I did culture the mucous on sensitive plate twice before I applied the medicines. I can only see some E.coli colonies and some clouds of the microbe picture above, which seemd not grow well on the plate. So I thought it might be mycoplasma(hard to culture) or gram-negtive bacteria infection. I didn't pay enought attention to the pictured microbe, since they were only a few of them under microscopy.
I first tried terramycin, which is mentioned in articles on tortoisetrust, and also I think it's the most common medicine to treat a RNS. I applied 10mg/ml terramycin into the nasal chambers and soak the tortoise in

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