Im sorry I don't understand why anyone would do this. Is a 1-3 gallon really gonna bring you any kind of joy or satisfaction.
Maybe for a week or two and then you'll become annoyed with constantly topping it up, cleaning the glass, changing the water, etc.
All for what? So you can watch a stick of sps grow painfully slow?
Just take the money you'd put into that and put it in your main tank
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