You can use panacur to kill planaria in a tank, it has the fabulous side effect of also killing hydra. It might also kill your snails too, so you have to watch out for an ammonia spike if that happens.
I did a very scientific little pinch in each 3 gallon shrimp tank I had. Planaria and hydra were toast by the following morning while the shrimp were happily doing shrimp things. This was from the dog dewormer concentration.
There's conflicting amounts to dose on the web, I couldn't tell ya what amount to dose.
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