Neutral I suppose. Some say OK, some say not OK. They're supposed to be harmless, except some people don't like the threads they put out ("unsightly nuisance"). I generally let them be in my tank. There have been a few I've used a tweezer and picked off (and then thrown into the back rubble behind the rockwork).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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