Red Planaria flatworms

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Red Planaria flatworms
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When I bought my 55g tank, it was infested with Flatworms - Red Planaria - which propagate via fission. They are known to increase rapidly, smothering the sandbed and corals. If they all die at once, that crash will wipe out a tank due to the toxicity of the flatworm juice. I vacuumed out 1000's over 10 months, and then dosed my tank with Salifert's Flatworm eXit which removed them entirely. 

Here's my article on their removal.