I have recently acquired a little RF yearling tortoise from a friend & from day one it had a strong odour "stink" mainly on it's plastron, I noticed this pungent smell became more prominent even in the enclosure's substrates where another red foot was kept also as this wasn't so prior. I force soak the tortoises once or twice daily, the odour seems to go away afterwards but returns sometime later, I put some Epsom salts in it's soaking water thinking a fungal infection might be the cause.