Refugium Stocking

[Squeaker]

My husband plans on making our extra 20g tall tank into a Refugium, but he wants to stock it with something, his philosophy "if it's empty it need we need more fish!" Any suggestions would be greatly appreciated. Thanks.

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[Sniperhank]

That isn't what a refugium is. A refugium is a place to let algae grow. It is also a place where pods can reproduce. All of this can only occur if it is free from being eaten, so putting livestock in there will end up in it being consumed.