hey Daryl , how bad are they , I just got through a big extermination of them ,
The only known creature to eradicate them is the abalone but they very scarce in the aquarium world ,
with my infestation I had to remove all my sand as they took it over I was able to cut my sand into bricks , there was so many it looked like I had a white carpet , I removed brick by brick till all the sand I could get was out , than I had to go back with a plastic putty knife to scrap off around the base of the rocks ,
now if there on the rocks this part really sucks , I only removed the rocks that had a good majority of them scraped them off did a 50/50 dip in peroxide than a dip in clean salt water , with the rocks that had a few i scraped them off as I sucked them out , this is where a helper comes in handy this gives you the advantage of getting them all off as your helper sucks them out , I didn't have that luxury and I kept over flowing my 5 gallon pail , as my attention was on those stupid snails , I now keep a plastic kiddie rake from a kids beach pail set , I rake the sand weekly and if I see any of those stalks I make sure to remove them as I don't plan on doing this again ,
this is what my infestation looked like ,