I'm hoping someone might know what this is. I have had my tank for 3 yrs now fish only seen some odd creatures come and go, like the white worm with black stripes with a round head and could streacth an inch or so before crawling back in the holes of the live rock but this thing here i cant find info on simply because i dont know what it is. i know there r lots of them, there hard and hollow about 1/4 to 3/8's in height, and spit out a web like substance from them can streatch about 3 inchs long, and food and debris get cought in them, a few bunched together makes a bigger web and collects more junk. any info is greatly appreciated.Hope i got the right pic up.