My current tank is 100% dry Marco rock, I cured it for 3 months in a Bin. To seed it I placed a sponge in previous tank for a while then put in bin with dry rock.
There are alot of people who will argue that live rock is better as you gave more biodiversity but tgat being said also includes pest
I have yet to see hydroids, many are or aptasia in my current tank and the culture seems to be great.
You can also buy pods to take up residence in your dry rock
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