I have had a small Lasius niger colony set up for the last couple of months, but now the sand in the formicarium is starting to go mouldy in an area near the straw approx 50 x 70mm. The ants have only recently ventured to the formicarium but have recently started to tunnel down the side of the straw also.
Is there any possibility that this will be harmful to the ants? I understand that ventilation is important and admit that I don't often take the lid off this area as I am worried about my ants escaping even though I have the double protection of Teflon and vaseline, but would this be the best way to fix it How often should I have it open and how often should I put water down the straw into the formicarium? I am worried about the sand getting too dry and weakening but want to have a good balance with the dampness but less if not no mould.. In the space of time of having that colony I have only put water in a couple of times and was actually worried that it might have not been enough.
I am new to ants so if anyone could help it would be greatly appreciated,
Thanks



