If you made them with portland cement you will need to cure them for about 8 weeks in water. You must change the water almost daily until the PH level in the water drops.
Marco rocks are a dry coral rock, I rinsed mine good in freshwater, then stuck them into a tub with newly received live rock and let them cure/cycle together.
I personally didn't do anything...set them in the tank and waited...the cycle took 6 weeks...I do remember that Marc recommended Turbo Start #900...but I didn't remember that until about 3 weeks into the cycle so I didn't get any...probably would not have anyway...it was going to be about $75 shipped for 8oz bottle to treat 150gal...
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