I very very rairly do a water change on my reef. i just add the water to compensate for the evap, and thats about it. as for the sand bed, i do get my paws in there atleast once every week or 2 and mix it up a bit. not like a hurricane, just enough to release the nitrate gas pockets. then my skimmer goes into overkill mode for a few days, and then its clean again.
on the odd, occasion, i may do a water change, like when im starting another tank,i will take about 20% of my water and use it for the new system. and then just top off the reef tank with fresh saltwater.
i have no algae problems, and never have had actually. knock on wood.
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