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If it were my tank I would probably leave that slot empty for now and add a refugium or chaeto reactor (similar to an enclosed refugium) later if you need it. The main purpose of either is a natural way to export some nitrate and phosphate. Additionally, if you run its light on a reverse schedule with your tank, it may slightly raise your base pH.This is what my current setup is. I was just wondering if it was worth it to put in that empty spot
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My filter floss is in this on the left and the skimmer next to it:
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Then I have my intank media basket on the right side
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and so I don't necessarily need to add a Fuge basket. That empty spot can just stay empty
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Cause I'm not really sure exactly what the purpose of copepods and a refugium is except for filtration and copepods eat diatoms and fish eat them. Is that basically the gest of those two things?
Adding copepods is almost always worthwhile. They eat diatoms but they also eat some other micro-algae. In general a healthy pod community will help to keep your tank cleaner. They of course are also a potential food source for other live stock in your tank. I would not add them however until the tank is somewhat established. Adding them right away can help reduce 'the uglies' but most of them will starve and die. Once the tank is established, they will find plenty of food sources.

The pink acan fell off it's frag plug, so I did my best to glue it back on. My best is not great since I also glued it to my finger. So.. that was fun!