I recently put some macroalgae in my tank and I think a couple of these little guys came with it. Wondering what they are. Little black slugs with white tipped spikes or tentacles coming out of their backs. I sucked one up into a feeding pipette to take a better picture of it and when I squirted it back into the tank, my fish tore it apart and ate it. They've been coming out when the lights are off. Very small, fingernail clipping sized. Only seen a few of them. Pest?
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