The big thing is that they eat detritis. When I find that they are overpopulating my display, I pull them out and put them in my sump/fuge, or get a 6 line to eat them up. I find them harmless (until you get poked by one... then I hate them).
The only time that I worry about them is if they are massive (bigger than 4" long or 1/2 cm thick) or if they look like fire or enucid worms, then they get flushed.
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They call it addiction for a reason...
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