They're THIS safe:
That's a Solenopsis fugax nanitic, less than 1mm long and probably one of the tiniest ants that can be kept properly.
Just for size comparison, these are Camponotus, the minors are about 10mm long.
I tested it because I wouldn't know how else to properly feed these itsy ants that could drown in a water droplet the size of a Lasius worker. Yes, q-tips soaked in water could be used but seriously, these dry out in a few horus.
The feeders are much more comfortable and I wanted to know if they are safe for even the tiniest of tiniest ants.
They are.
Edited by Serafine, September 12 2017 - 12:03 PM.