I've randomly kept them in the past as well... but never seen them red like that... brown / beige colors quite common... but that red almost looks like a cherry red shrimp red...
I've had a few of these guys before. Really cool to watch them clean their fans. Always in the same order; top right, top left, bottom right, bottom left. Lol one of mine had a slight red tint but I would still call it brown. Nothing like yours.