Here is a question from Karla,
I live in Texas where the red ants are always a problem.
Well at least once a month I find them in one of my bins. My bin or
kept on the deck in the back yard. Will they eat my worms? What can I
do to keep them out? Will ant killer, kill my worms?
Ants are a common pest in outdoor worm bins. Generally, if you maintain ideal conditions for your worms however, they shouldn’t create too much of a problem. Ants prefer much drier conditions than worms, so keeping your worm bed nice and moist (assuming good drainage) is a good start.
Ants also tend to be much more interested in the food scraps in a worm composting system than in the worms themselves. That being said, aggressive species like fire ants can probably cause some issues if abundant enough.
I definitely would NOT add any sort of ant killer to your worm bin – this could definitely harm or kill your worms, not to mention the rest of the compost ecosystem. Aside from keeping the system moist, perhaps you could try some other strategies to discourage the ants from coming in to the bin in the first place. Try setting up a perimeter of diatomaceous earth on the ground around your bin – this should greatly harm any ants that try to cross it, since it is essentially like a field of broken glass for bugs (ouch!).
You may also want to try some other relatively innocuous deterents. Put some honey mixed with borax in shallow dishes near the bin. The ants should start focusing on this pretty quickly, and when they take this material back to their nest, it can end up killing off a lot more ants.
If you know the location of ant nests on your property, you might try pouring boiling water on them – not the nicest thing to do (haha), but when push comes to shove, you gotta do whatcha gotta do!
Hope this helps!