The slime is bacteria. Bacteria are everywhere, and they will colonize any water that isn't sterilized and totally sealed off. It doesn't hurt anything directly, but it can clog up the ATO hose and put extra stress on the pump. You just need to clean the reservoir once a month or so. If you let it dry out after you clean it out it will stay slime-free for longer.
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~ Mindy
SPS fanatic.
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