My skimmerless 37 gal. seahorse tank is literally crawling with huge bristleworms. At feeding time these guys come out of their rocks and crawl all over the tank looking for goodies. I counted 5 huge (6-7") worms in one small area the other day. I managed to snag one and put him in my 200 gal. to build up the worm population there. Hope to grab another one or two over the next couple of days. Another area of the tank has a virtual NEST of smaller worms (2-3") They are not shy! They don't bother anything just go after the food that drops on the rocks and sand. Since the skimmer pretty much stopped skimming about 3 months ago I have noticed a huge increase in sandbed life, including these worms. Baby stars are nestled in every fold of every leaf of caulerpa and sargassum, the little tube worms with the long white tendrils cover every inch of sandbed, pods are all over the glass (much to the delight of my Mandarin). The tank is teeming with life. Very cool! BTW - this tank is just under a year old. Started it last November.