Today I saw that all the pots without charcoal are with small red ants. There is not a single ant in the pot with charcoal addition.

Although I love ants, to avoid ants eating away the seeds sown, we could always add some charcoal along with the seeds. Second important application is that in the Vermicompost pits some ants eat away the earthworms to avoid such problem and for value addition to the compost to create a habitat for microbes, we could as well add charcoal.