Mandarins & other small goby type fish may not be safe with tube anemones if the tube anemone is big & the fish is small. Mine never did any harm as far as I could tell but this is something I've been told to be careful about. Try an above tank refugium, so the pods would gravity feed down into the tank, rather than go through a pump impeller.
If you want more room in the tank & still have enough LR, I keep extra LR in the refugium.
Anthony
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