i've done it many times... it induced my convicts to spawn within a day or two on multiple occasions (years back). my discus, keyholes, and bleeding heart tetras seem to be drawn to the worms more than my other fish. In fact, we were digging up a part of a flower bed two days ago to move the edge of it out a bit, and i found about 4 FAT earthworms that were cut by the shovel... I immediately took them inside, rinsed them under the faucet, put them in a ziplock bag and into the freezer, and I break pieces off for my fish as a little protein snack. A word of warning, the frozen worms are GOOEY when they start to melt in your hand. I figure between rinsing them and freezing them, most of the nasties are neutralized. I also have a UV which should keep water-borne parasites at bay(i'm thinking bacteria and fungus that might be able to hitch a ride on the worm). I can't say that they're 100% safe fresh, but they're probably as safe as buying cultured live blackworms, etc online. I say go for it.
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