I think the paper test would be a smart thing to do. Use a thin piece of paper, and slide it around the outside edge of the glass, and if it can clip through, small species will be able to get through. If not however, then it is quite unlikely that any ant would be thinner than a piece of paper.
Species being kept:
Solenopsis "plebeius", Camponotus maritimus, Formica cf. subaenescens, Formica cf. aerata, Lasius cf. americanus, Lasius aphidicola, Lasius brevicornis, Lasius nr claviger, Nylanderia vividula, Temnothorax nevadensis, Temnothorax chandleri, Temnothorax arboreus Solenopsis validiuscula, Solenopsis truncorum, Solenopsis xyloni, Formica perpilosa, Formica cf. lasiodes, Formica cf. neogagates Pogonomyrmex californicus, Pogonomyrmex salinus, and Myrmecocystus testaceus!!!!
Hoping to find this year:
Myrmecocystus, Liometopum occidentale, Camponotus essigi, Camponotus fragilis, Manica bradleyi, Formica perpilosa, Pheidole hyatti, and a Parasitic Formica sp.
People are stupid. It explains a lot...