Ok my herculaneus tank is looking bad, I shone a torch on it today and there are many small fly insects crawling round on the surface, they look like they have silvery coloured wings/shell but didnt seem to fly at all, their bodies are long and thin only a mm or two long.
This tank is kept very moist and has a loam/humus mixture.
i've been a little worried about this colony as they had 8 workers before digging themselves in and I've only seen a single worker outside on a few occasions so far this year.
edited for better description. I had another look they are long, thin and shiny, the wings could be shells or just their bodies. They seem to have gone into hiding, because when i checked earlier I saw many, now I only saw one









