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I heard from the city water guy that using dechlorinators isn't the best way to removing chlorine b/c it contains sulfur and that isn't good for them either. He says the best way is to let the water sit for a day and allow the gases to escape. Has anybody else heard of this? Its not a big concern for me though b/c I've always used a dechlorinator and I haven't seen any effects on my fish.