stuck

Yesterday I noticed one of my female nourisatti wouldn't/couldnt close her mouth. She swims and eats fine. Looked inside and there's nothing stuck. Anyone ever encounter something like this.

I have a bulkhead stuck on the bottom of my overflow on a 150 gallon tank. It is stuck about 1/2 between tight and off. The space around the bulkhead is very limited(drain a couple inches away, stand a couple inches on the the other side. I think the best way to get the bulkhead off at this...