I really love Wysong Ferret Epigen. It was recommended to me by a local exotic pet vet and seems like it improved my ferrets poop and coat and overall energy levels. One of mine was originally on Marshall when we got her but I switched her over little by little (instructions are on the back of the bag) You can get it on amazon and it lasts me a few months. https://www.amazon.com/Wysong-Ferret-Epigen-Digestive-Support/dp/B019W9VXZK
for ferret food. That Marshall's ferret food is crap for them
Do Not Use Any Kind of Old Tube, Also you do not need to bathe ferrets at all.