confusion

Hello everyone! SO, the rock in my tank has these spikey like tube things sticking out EVERYWHERE?! From the research that Ive done so far, it seems like they could be Spaghetti Worms, but ive never seen anything come out of them! Or, they could be Sand Tube Worms BUT I just dont understand...

One of the weirdest trends in reefing has to be the increased use of bleach in the hobby. Once upon a time it was only (mis-)used to clean dirty filters and such. These days the most common use for it seems to be soaking live rock in it — to kill it. Did we flashback to the 1960s when this...