Ask most enthusiasts who have also made formicarium aquarium. When the glass surrounding the entire nest, evaporation is minimal. What are the problems that it can become? I initially thought that a month after the chamber humidity was still 80%, but it's true. Basically, it does not hurt, and when the nest is inhabited by the situation might change. I do not know I think so.
Does anyone have experience of grout? In particular tile grout? I've done now 8 nest of tile grout.Some facts... Grout is alkaline and how it affects the lives of ants. I have experience from a single colony and it is doing well. Gypsum and other materials is very kind of ph as the nature and wonder why it does not affect the ants ??
Grout is a fluid form of concrete, containing water, cement and sand. en.m.wikipedia.org/wiki/Grout All natural products for ants to live in, in the wild. We live in a high chalk area on the Sussex downs (UK). The rubras, nigers and flavus all thrive in this area, some parts being mixed areas with one side chalk mixed with flint, graduating to soil. They get both worlds, with dryness and moisture Gypsum en.m.wikipedia.org/wiki/Gypsum is similar, found in blackboard chalk and many forms of plaster mainly known as alabaster. Used in many cultures for carving and sculpture, it is also soft and over time breaks down in water. Both natural products that ants like, for formicariums very delicate and care has to be taken regarding its crumbeling properties similar to ytong. I have known members to use both these substances, including Polyfiller which is a cement based powder for diy purposes to fill holes in walls here.