I have one tank that uses them. The way I have the sump setup, it's quite a PITA to swap out. They have helped polish the water some, but the main reason I have them is to compensate for a bad original sump plan that included way too powerful a pump and thus there are terrible microbubbles in the tank without the sock.
Honestly I think I would do away with them if I could. I also hate that I'm a bleeding heart and sit there for 5 minutes picking out copepods, worms, brittle stars, and chitons to toss them back in the tank, which makes changing the socks out even more of a chore.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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