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I am currently running a wet dry filter on my FOLWR tank and started going more towards building a reef tank. Would it be best to switch over to a refugium rather than sticking with a wet/dry filter? If so, why?
 

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If you have live rock, there isn't even a benefit or point to running a wet/dry filter. For a reef tank it will add more problems then anything.

Whether you choose to run a fuge or not, as long as you have live rock for your bacteria to grow you should remove the wet/dry anyway.
 

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eric hit the nail on the head. live rock are able to hold all the bacteria you need.

a wet/dry filter's purpose is to house nitrifying bacteria, live rock can house nitrifying and denitrifying bacteria putting it one step above wet/dry filters.

a refugium would be designed for nutrient export, or to export phosphates and nitrates along with other nutrients after the live rock or wet/dry filter have broken detritus and fish poop down into nitrates, phosphates and other nutrients.

a refugium is not a replacement for a wet/dry filter or live rock but rather a extension to help export nutrients.

So to answer your question, ditch the wet/dry. whether or not you run a refugium is more up to you and your maintenance routine. if your cleaning your tank well enough a refugium shouldn't be needed to control nutrients. if you find your ideal maintenance routine doesn't quite do the trick then you could benefit from a refugium and should also reconsider your maintenance routine.
 
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