Look into Diatomaceous Earth. I've used it with good results in compost piles to get rid of fire ants. I chose it because it's non toxic and wouldn't harm the worms. Do your research but it's naturally occurring and appears to be safe for fish as well.

https://en.wikipedia.org/wiki/Diatomaceous_earth



Last edited by KillJoy; 08/01/18 09:35 AM.