Recently discovered in the gravel in our 240 ltr aquarium. It's about 2 inches long lots of hair like tentacles/ filaments and was living under the gravel with the filaments gathering bits of gravel and small stones to make a mound,the filaments spreading out from the top of the mound.have removed and quarantined it till we know it isn't harmful to the other occupants in the tank.thanks in advance harvey
