Is this a worm, or leech? Heres two of them I pulled out of my substrate today. One side seems to have a sucker of some sort maybe? The other end is constantly wiggling around probing. Whatcha think? They are very dark brown.
I figured some sort of leech. Thanks for the replies.
I haven't noticed anything affecting my fish, they seem to prefer living in the substrate. Think its ok to just leave em? Doesn't seem like theres much alternative anyways...
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