Hmm... I would say you could put a tiny bit of nail polish on them... But it will shed off. And I would put it FAR from the head. Fumes could really hurt them.

Uh oh...... You got me with the two non feeders going together.... If you can't find a place for them... I would take 2.2 + the 2 non feeders... Thats if you can't find anywhere else for them to go. I feel like I may come across as being greedy. lol!