Welcome to the hobby! It sounds like you are off to a good start. As far as sand beds go I would only put a shallow one in or none at all. I have a 25g reef without a sand bed and it doesn't take long for pieces of rock and rubble to start covering the bottom. I chose to go no sand bed on this tank because wastes don't collect and decompose as readily and any tank I have went bare bottom has never had any type of algae or cyno issues.
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