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The definition of refugium is "an area of refuge". In the reefkeeping world this translates (most commonly but not always limited to) an area of refuge for pods and other microfauna. Basically an area where pods can live and reproduce without predation from the tank inhabitants. Essentially anyone with a sump without pod eating predators in it has a refugium (refugium for pods that is). Often people take advantage of this space by utilizing the area for the growth of macroalgea to reduce nutrients. The growth of macroalgea doesn't make or break it as a refugium, but merely changes the living circumstances for the pods/fauna.


I love my refugium. When I added Chaeto to it, instead of the other algae that was going asexual, I saw an instant change in my main display! The dinoflagelletes that were haunting my system went away! Plus pods can grow for my mandarin!
I love my regufium, but I do not agree with this. I'm not an expert, but I think that dinoflagellates are just a part of the cycling. I hope someone with expertise chimes in. As a metter of fact, the dinos went away in my DT on their own. When I put up a refugium, after a while it got dinos. I expect they will disappear from my refugium in time too.

