I've had these before in a tank waaaay back around 99 or 00. Yes, they are a type of Planarian. They are photosynthetic and really annoying in that way... because they just kept feeding off the light and multiplying. I don't recall finding a solution... before I stripped down the tank cus I was finishing school and moving.
They were in a small 10 gal tank where I housed a mantis shrimp, so I didn't try too many options against them.
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