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I've been a habitual over feeder in the past and in my 29 biocube I had a huge problem. In my 105, not so much, but I keep an eye out for them anyway and agree they do provide a service. I've heard they can kill clams and other sandbed dwelling corals if they are numerous.
I would not feed less. Yes bristleworms will grow larger but I can see your tank looks healthy and food does that. I would use a trap that you can buy or build for pennies as those things will grow very large and yes, they do kill clams. I also have a bunch of them and occasionally trap 30 or so to thin out the herd. We are much to worried about water, parameters, bristleworms and global warming but should be more aware of our tanks need for food to keep them in excellent condition as most fish are starving.