10-24-2010, 08:39 PM
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I doubt the worms are anything to worry about, but in general if you want to add things you found from nature they should be from a non polluted source. As far as taking things from the water, it is alot riskier then using stuff you found on land. Aquatic ecosystems crawl with micro and macro organisms most of which are not fish. They are usually crustaceans, insects(adult, larvae, and egg), mollusca, and other less derived organisms. However disease is much less common in nature then it is our fish tanks. None the less its a good idea to not take stuff from stagnant water.