[Drago]

I would definitely remove it as soon as possible. There are so many risks associated with cotton/fluff bedding, it can get caught around teeth or limbs which could possibly cut off circulation, or can be swallowed and cause intestinal blockages. As amityville has advised, never trust pet store advice, their information is either outdated, or based on speculation/completely wrong. Tissue and toilet paper is very soft and insulation for hams, not only that but it's 100% safe and is very cheap. Cotton/fluff is extremely dangerous to their health so swap it for a paper based option. Best of luck