i was doing some research, trying to identify these red worms i have in my tank. i see that there are 2 kinds that look very alike, but i am not sure which kind they are (maybe both?!) i have so many of them in my tank varying in all different sizes. they do seem to have the bristles, the large ones live in or under the rocks. today, for the first time, i saw a large worm actually excrete something red that looked like a powder. it did this in one of my blue damsels favorite spot. is this the toxin that they release which is harmful? im terribly worried about my fish. i have had no deaths, and would love it to remain that way. im a college kid with a growing fascination for this tank ive been trying to uphold for a couple of years now (w/o the necessary maintenance at times.)