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The commercial product is Joe's Juice for around 8 bucks.
However, you can also use concentrated lemon juice to get rid of the little buggers. Used it a couple times...always has worked with one shot. Here's a link:
Cheapest is probably kalkwasser. I tried Joe's Juice (which is basically diluted kalk) and it didn't work that great. Aiptasia-X worked very well for me because it's pastier and the syringes are nicer.
kind of goofy question --- but i read that Joes Juice may affect my anemone and I just cant see myself running with applicator all over my tank. any inverts that might do the job for me?
Pep shrimp might do it. They are 50-50 though. CBB will do it but you will not have a single featherduster left in tank after. Also, they are notorious for not eating and starving themselves to death. What nems do you have in tank? Joe's Juice/Aiptasia X is a paste that is basically kalk. It should not harm anything unless you shoot it right onto them.
SW fish has them usually for 5 for $20. Most LFS have them for about $8. Make sure they are peps and not camelback. Camelbacks are not reef safe at all. Some peps have also been reported to eat featherdusters and nip corals.