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4 years all parameters r in check…can’t put glue…coz the r so many at so many places….n my tank is prity crowded…..is there one thing that eat those thing like bumblebee…but this r very spiky not like round n round n thick at bottom like vermit..Check your parameters, how much flow are they getting? Anyway looks like vermiteds or spinoid worms, to be safe I'd put a (very small) dab of coral glue on the ends of the tubes in case its a vermited. How old is that tank?