We have the most lovely little Sussex chook that has always been a bit sneezy and snotty - it’s never gone away. She’s around 15 weeks old (we got her at around 6 weeks), it’s never seemed to affect her, she eats well, she’s happy... but it seems weird she can’t seem to shift it. We have 5 other chooks and none of them have ever showed any sign of being unwell. I have ACV in their water, and some nutrients in their food - but am feeling useless that it hasn’t gone away! Other than a slightly runny nose and being a bit sneezy she is fine... but today one side of her nose was a bit gummed up with some dirt so I’m worried both sides might while I’m not home. Any suggestions?