How often do you change your GAC?

[galleon]

I do mine weekly.

 

[mc-cro]

1 cup per 220g, changed out every 3 weeks

 

[westreef]

I have 75 G mixed reef and I use 1/2 cup of GAC every month.

 

[cgomez87]

I use 1 cup in my 140g system change it out every 4 weeks

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[Nanook]

I use a half gallon of Rox .8 and change it out every 3-4 weeks...sometimes more frequently if something looks amiss, or if the water smells fishy.

 

[OffDaHook]

Every 4 weeks

 

[sweet ride]

I change it every 4 weeks as well.

 

[RobbReef]

I do a cup every 3-4 weeks but then again i get lazy sometimes.....=)