Well you're right that in this case i shouldnt risk it. Since i really dont know if they have been exposed.
But in the other case. You shouldnt just feed your cichlids pellets and only pellets. They need a variety of food. Especially Oscars since they are so prone to HITH. A varied diet has proven effective in warding off HITH among other things.
I'll just continue to buy his bugs and worms.

I hate paying for stuff that crawls around outside. Stupid pesticides.