I agree..sounds like plastic..hope you sanitized the poo out of it..if you did you should be fine..worst case scenario if it doesnt clear out and settle is your going to have to maybe strain a whole batch through a coffee filter or something..what a pain in the bum.
I use spring water to top off in my secondary..my tap water has cloramine so I cant boil to declorinate and wife is sensitive to sulfites so no campden..and on a gallon batch just a pinch of yeast nutrient is always good.
I may be moving down to thw birth soon..hope you guys are up and running. .and congrats on the little one..hope mom and baby are both happy and healthy.Cheers!