a few months ago i noticed a few little white tube-like things with tentacles that look like clear hairs coming out of them growing in the sand of my tank. lately they seem to have spread everywhere... in the sand, on the rocks, in the filter. they seem to be eating more food than my fish are. i have no idea what they are, ive googled for about two hours now and came up with nothing. they are too small to get a clear picture of. what are they, are they bad, and if so how do i kill them???
TIA
Rich
TIA
Rich