[smokinreefer]

yeah, whats up with all the smilies lately?

anyhow, i agree that something is outta whack in the 20. one factor is food. the BW have to have enough food to sustain such a large population. so you may want to try cutting down on the feedings. and yeah, i believe cleaners are predators of BW, well atleast of small ones.
so the introduction of a cleaner may be a good idea...it can help control the growth and production of the little ones, the larger ones will survive and continue to breed, but their numbers will be controlled by the cleaner.
eventually if food input is controlled, some larger ones will die off, or maybe cannabilized by others, and you should at some point end up with a balance of large and small BW. make sense?

FWIW, i have rarely seen small bristle worms in my display, which has cleaner shrimp. i've only seen faily large ones in there, but my refugium has small ones in it.

HTH