Hello there,
A couple of things--
Quarantine means separate cages in
different rooms. It's meant to stop any diseases or parasites that your new pig may have from infecting your previous pig. Since you have them right next to each other they are not really quarantined.
Your cage/cages are much too small. Ideally, a pair of guinea pigs should have at least 10 square feet of living space. Have you checked out the cages at
Guinea Pig Cages, Your Cavy At Home yet? If you attempt to keep a pair of guinea pigs in one of those pet store cages you are just asking for trouble.
Beast sounds stressed out. Read
this page on introductions from
Index of / .
As for fleece bedding, read
this page from Guinea Lynx.