Hi,
I have made my own reef base rock before (argonite and portland cement). But I stop making them once I found out about Caribsea's Reef rocks. They are pre-crush blocks of argonite and its about $1.25 a pound from J&L. I have used them for about 4 years in my tank and they look just as cool as any live rock that I have from Fiji. They take about 6 to 12 months to fully seed and cover with coraline.
- Victor.
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