bristleworms are asexual and will multiply as they see fit to eat up all the crap from your tank once they have fed on all the crap they see they will start dying off ,the worst case of cristle orms (and unfortunately the demise of my 75G tank, was when hurrican ike hit as soon as the power went out after an hour i started loosing fish and as they were dying the bristleworms were multiplying just as fast eating everything they saw dead tbh if it werent for them the house woulda stunk 100x worse than it did while we were moving the tank outside i will say at the end of us getting rid of all the water and taking the tank outside what used to be a 3" sandbed was now literraly a 3" bed of bristleworms some as long as about 2 feet and as fat as a sharpie ..... not trying to scare you lol really im not, just saying a very helpful CUC member but the more crap you have in your tank as far as die off the more they will reproduce but if you dont have die off theyt will stay under control , they never bothered corals or anything alive
geez long story :( sry i got carried away