I have seven guineas grown but not yet laying. I've noticed just lately one not moving around much any more. I was able to go up and pet her/him. At other times it seems to move around just fine. I've also noticed at feeding times one chasing it off. I'm thinking it may be worms. Probably need to worm them all any way even if that's not the problem. What type of wormer should I use? I did add some Diatomaceous Earth to their water. Would that be enough?