I have a pair made up of a Lemonpeel and a Coral Beauty at school. They have been on their own since the beginning of winter break, so hopefully they will make it through Monday. The custodians are feeding for me until we get back, but that was only for a few days. I'll keep my eye out on whether they clean each other - honestly to me it looked like sparring, but sparring and defensive postures are very similar to inviting a cleaner from what I've seen.