Not odd at all. Every tank has tons of them. You shouldnt be worried at all. I dont think its even possible to have a tank without them. My cousins tank use to have ones that were literally the size and thickness of a old school hb pencil.
I heard it is possible for them to eat fish, if they're big enough and the fish is small enough, maybe like a small sleeping clown goby? lol.
Arrow crabs take care of them and also maybe some wrasses? my cousin told me his sixline would eat the smaller ones if hungry enough.
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