von Phasmid » 2. Feb 2009 18:32
Messor are happy with very little humidity so spraying the y-tong every so often should be enough.
They can still see the light with this sheet and they will notice changes in light, but it is much better than nothing at all, for the PVC sheet to be thick enough so that the ants think they are in total darkness you will hardly be able to see the ants anyway, you could have the thin sheet and a black-out cover so that when you remove the cover the ants are less stressed.