So I bought a used fx6 for $75 yesterday. ...the owner said he had only used it for a few months...I could tell it wasn't used long....when I opened the fx6 I saw that the 6 white foam filter blocks were actually pink......all these pads barely looked used but I was curious as to if there is any chemical that could of caused this?....either way I don't know what has been in his tank.......but these pads barely looked used. ......should I just boil them ?