Originally Posted by Jason4390
I've learned that the difference in SG would pretty much kill the live rock. That's ok. I still just want it to take over some of the filtration. If I bought just base rock and let the bacteria grow, would it start to take over some of the filtration?
Sell the live rock to a marine fish store and purchase porous dead base rock. This way you are still creating live rock suitable for your tank, without the unnecessary of killing actual marine live rock.
The live rock essentially is going to become dead rock anyway in a brackish tank, it would turn live again once the tank is cycled.
Marine live rock sells for $6+ a lb so if your LFS gives you credit you can use that to purchase the dead base rock.