I'm new to the whole salt water aquarium thing. I have a 29g biocube and was wondering how often I should be doing water changes. That's in advance for any help.
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Water changes would all be based off of what your water parameters are telling you. If your nitrates are creeping up on you, you will need to do a water change to get them down. Some will do weekly water changes, some every 2 weeks, some once a month, some of us twice a year, but we do things to our tanks that allows this to happen.
But for the majority, its weekly 5-10% water change.