My female res tried to bite me as I was getting her out of her tank. I have had her almost 4 months and this has never happened before. when i got her out she opened her mouth and was trying to get my hand she also made a hissing noise as if she was aggravated. i put her back and tried again a little later and she did the same thing. she does not however seem aggrasive to my other res. what could be wrong



