+1 These guys might not have much in the looks department but they are a great part of your CUC. Just don't touch them if you can resist :P. There's one main Amphinomid (the kind of worm they are) called Hermodice carunculata that should cause concern but you don't appear to have that one. They're like snails in freshwater planted tanks in the sense that their numbers will heavily depend on how much food goes into the system.
I get happy when I see mine poking around :P.
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