Maybe the fish you have ,or had in the past cleaned out the pod population.What kind of fish do you have?Have you never see any pods since you started your tank?
Maybe put some live sand or a piece of live rock in your refuge
and when you see that they've migrated to your main tank in large numbers ,then try a Mandarin.It might take some time,but if you're going
slow anyways it should work out.
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No matter how hard you try, you can't baptise cats.
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