So, it's 3 hens and 2 guinea hens. 1 hen is laying every day and is well. The others seemed to go through a molt and all have not layed in weeks. The youngest hen has mucky bottom, and I noticed the runny poop and the flecks of white in the poop, so I thought maybe worms?
With so few hens you could get a small bottle of Valbazen:
Give 0.08ml per pound orally and repeat in ten days.