what there meaning salty is that you need to do more research into SW tanks, how to keep them, stability, and such SW isn't something you want to mess with my 25g nano, now has probably close to 1000$ invested in it, expect for a 10g to have 500$+ for a proper setup, skimmer,lights,rock,powerheads it all adds up.
let alone corals which are living animals just like a dog or cat, there not cheap and are semi endangered in a way so I suggest read more before doing anything else on your cube
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